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3GPP TS 23.228V13.5.0 (2016-03)Technical Specification

3rd Generation Partnership Project;Technical Specification Group Services and System Aspects;

IP Multimedia Subsystem (IMS;Sta!e "

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The present document has been developed within the 3rd Generation Partnership Project (3GPP TM) and may be further elaborated for the purposes of 3GPP.

The present document has not been subject to any approval process by the 3GPP Orani!ational Partners and shall not be implemented.

This "pecification is provided for future development wor# within 3GPP only. The Orani!ational Partners accept no liability for any use of this

"pecification."pecifications and reports for implementation of the 3GPPTMsystem should be obtained via the 3GPP Orani!ational Partners$ Publications Offices.

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%eywordsLTE, GSM, UMTS, multimedia, pa!et m"de, #P

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'o part may be reproduced ecept as authori!ed by written permission.The copyriht and the foreoin restriction etend to reproduction in all media.

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"tet%

9oreword........................................................................................................................................................

, "cope....................................................................................................................................................* 0eferences............................................................................................................................................

3 4efinitions symbols and abbreviations................................................................................................3., 4efinitions.........................................................................................................................................................3.* "ymbols.............................................................................................................................................................3.3 /bbreviations.....................................................................................................................................................

: &P multimedia subsystem concepts.......................................................................................................:.+ General...............................................................................................................................................................:., 0elationship to 2" domain and the &P;2onnectivity /ccess 'etwor#..............................................................:.* &M" services concepts.......................................................................................................................................

:.*.,

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:.-., Proy;2"29.................................................................................................................................................:.-.* &nterroatin;2"29......................................................................................................................................:.-.*.+ General...................................................................................................................................................:.-.*., Aoid........................................................................................................................................................

:.-.3 "ervin;2"29..............................................................................................................................................:.-.: 1rea#out Gateway 2ontrol 9unction...........................................................................................................

:.-.= Aoid..............................................................................................................................................................:.@ Multimedia 0esource 9unction..........................................................................................................................:.@a Media 0esource 1ro#er.....................................................................................................................................:.D "ecurity 2oncepts..............................................................................................................................................

:.E 2harin 2oncepts.............................................................................................................................................:.,+ &M" roup manaement concepts.....................................................................................................................:.,+.+ General.........................................................................................................................................................:.,+., &M" roup administration............................................................................................................................:.,+.* Group identifiers..........................................................................................................................................:.,, 0elationship to 3GPP Generic 5ser Profile (G5P)...........................................................................................

:.,* 'etwor# /ddress Translation traversal in access networ#................................................................................:.,3 &dentification of &M" communication "ervices.................................................................................................:.,3., General.........................................................................................................................................................

:.,3.* &dentification of &M" communication "ervices...........................................................................................:.,3.3 &dentification of &M" applications...............................................................................................................

:.,: 1order 2ontrol concepts....................................................................................................................................:.,= &M" in transit networ# scenarios.......................................................................................................................:.,=., General concepts..........................................................................................................................................:.,=.* &M" transit networ# confiurations.............................................................................................................:.,=.3 Providin &M" application services in transit networ# scenarios................................................................:.,=a 0oamin /rchitecture for Aoice over &M" with 7ocal 1rea#out......................................................................

:.,- "upport of multimedia telephony......................................................................................................................:.,-., Telephony /pplication "erver......................................................................................................................:.,-.* &dentification of multimedia telephony.............................................................................................................:.,-.3 "ession setup principles.....................................................................................................................................:.,@ "upport of short messae service......................................................................................................................

:.,@., &P "hort Messae Gateway (&P;"M;GB)....................................................................................................:.,D "upport of 'umber portability..........................................................................................................................:.,D., 'umber portability.......................................................................................................................................:.,E "upport of Preferred 2ircuit 2arrier /ccess and Per 2all 2ircuit 2arrier "election.........................................:.,E., Preferred 2ircuit 2arrier /ccess and Per 2all 2ircuit 2arrier "election.....................................................:.*+ "upport of &M" "ervice 2entrali!ation and 2ontinuity.....................................................................................:.*, "upport of Overlap "inallin...........................................................................................................................

:.** "upport of plicit 2onestion 'otification (2').........................................................................................:.**., General.........................................................................................................................................................:.**.* 2" G0/'C5T0/' &nterwor#in at MG29C&M;MGB...........................................................................:.**.3 &nterwor#in with non;2' &P networ# andCor terminal at &129CTrGB...................................................:.**.: &nterwor#in with non;3GPP 2' &P terminal at &129CTrGB..................................................................:.**.= 2' support at &M";/7GC&M";/GB........................................................................................................

:.**.- 2' support at M092CM09P.....................................................................................................................:.**.@ 2" G0/'C5T0/' &nterwor#in at the M"2 "erver enhanced for &2"CM"2 "erver enhanced for

"0A22 with "&PC2";MGB.......................................................................................................... ......... .....:.*3 "upport of 7oad 1alancin................................................................................................................................:.*3., General.........................................................................................................................................................:.*3.* 0eistration;based load balancin of ";2"29s...........................................................................................

:.*3.3 0eistration independent load balancin of Transit 9unctions....................................................................:.*: "upport of 0estoration Procedures....................................................................................................................:.*= "upport of Overload 2ontrol.............................................................................................................................:.*=., General.........................................................................................................................................................:.*=.* 'et;hop monitorin of overload................................................................................................................:.*=.3 9ilter based Overload 2ontrol......................................................................................................................

:.*- "upport for 1usiness Trun#in..........................................................................................................................

= &P multimedia subsystem procedures....................................................................................................=.+ General...............................................................................................................................................................

=.+a "ession;unrelated procedures............................................................................................................................

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=., 2"29 related procedures...................................................................................................................................=.,.+ stablishin &P;2onnectivity /ccess 'etwor# bearer for &M 2' "ubsystem 0elated "inallin..............=.,., Procedures related to Proy;2"29 discovery..............................................................................................=.,.,.+ General...................................................................................................................................................

=.,.,., 4o" and session sinallin..........................................................................................=.:.@.+ General...................................................................................................................................................=.:.@., /uthori!e >o" 0esources......................................................................................................................=.:.@.,a 0esource 0eservation with Policy and 2harin 2ontrol......................................................................

=.:.@.* nablin of Media 9lows.......................................................................................................................

=.:.@.3 4isablin of Media 9lows......................................................................................................................=.:.@.: 0evo#e /uthori!ation for &P;2onnectivity /ccess 'etwor# and &P 0esources.....................................=.:.@.= &ndication of &P;2onnectivity /ccess 'etwor# bearer release...............................................................=.:.@.- /uthori!ation of &P;2onnectivity /ccess 'etwor# bearer modification...............................................

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=.:.@.@ &ndication of &P;2onnectivity /ccess 'etwor# bearer modification.....................................................=.:.@.D "harin of 0esources for 'etwor# 4etected 2oncurrent "essions........................................................=.:.@.D., 'etwor# 4etected 2oncurrent "essions...........................................................................................=.:.@.D.* &nitiatin 0esource "harin 9or 'etwor# 4etected 2oncurrent "essions........................................

=.:.@.D.3 Aoid........................................................................................................................................................=.:.D >o";/ssured Preconditions.........................................................................................................................

=.:.E vent and information distribution..............................................................................................................=.:.E.+ General...................................................................................................................................................=.:.E., "ubscription to event notifications.........................................................................................................=.:.,+ Aoid..............................................................................................................................................................

=.:.,, "inallin Transport &nterwor#in...............................................................................................................=.:.,* 2onfiuration and 0outin principles for Public "ervice &dentities............................................................=.:.,*.+ General...................................................................................................................................................=.:.,*., P"&s on the oriinatin side....................................................................................................................=.:.,*.* P"&s on the terminatin side...................................................................................................................=.:.,*.3 "ubdomain based P"&s...........................................................................................................................

=.:.,*.: P"& confiuration in the

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=.,+.+ General.......................................................................................................................................................=.,+., Terminal initiated session release..............................................................................................................=.,+.* P"T' initiated session release...................................................................................................................=.,+.3 'etwor# initiated session release...............................................................................................................

=.,+.3.+ 0emoval of &P;2/' bearers used to transport &M" "&P sinallin.....................................................=.,+.3., 'etwor# initiated session release ; P;2"29 initiated..........................................................................

=.,+.3.,.+ General............................................................................................................................................=.,+.3.,., 'etwor# initiated session release ; P;2"29 initiated F after removal of &P;2onnectivity

/ccess 'etwor# bearer................................................................................................................. ..=.,+.3.,.* Aoid.................................................................................................................................................

=.,+.3.* 'etwor# initiated session release ; ";2"29 &nitiated..........................................................................=.,, Procedures to enable enhanced multimedia services.......................................................................................=.,,., "ession

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=.,:.+ General.......................................................................................................................................................=.,:., &nteractions between the 5 and the M092.............................................................................................=.,:.* "ervice control based interactions between the M092 and the /"...........................................................=.,:.3 &nteractions for services usin both the 5t interface and M092 capabilities...........................................

=.,:.: Transcodin services involvin the M092CM09P....................................................................................=.,= Mobile Terminatin session procedure for un#nown user...............................................................................

=.,=.+ General.......................................................................................................................................................=.,=., 5n#nown user determined in the

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Annex A (Informative): Information flow template.........................................................................

Annex B (Informative): Void..............................................................................................................

Annex C: Void.....................................................................................................................................

Annex D: Void.....................................................................................................................................

Annex E (Normative): IP-Connectivit Acce!! Networ" !pecific concept! w#en $!in% &P'

andor EP to acce!! I*...........................................................................

.+ General...............................................................................................................................................

., Mobility related concepts....................................................................................................................,.+ General..............................................................................................................................................................,., Procedures for P;2"29 discovery....................................................................................................................,.,.+ General........................................................................................................................................................,.,., GP0"CP" procedure for P;2"29 discovery............................................................................................

.* >o" related concepts...........................................................................................................................*., /pplication 7evel "inallin for &M"..............................................................................................................*.,.+ General.......................................................................................................................................................

.*.,., >o" 0e?uirements for /pplication 7evel "inallin.................................................................................*.,.* 0e?uirements for &M 2' subsystem sinallin fla...................................................................................*.,.3 /pplication 7evel "inallin support for &M" services..............................................................................*.,a P4P contetCP" 1earer procedures for &M"..................................................................................................*.,a., stablishin P4P 2ontetCP" bearer for &M 2' "ubsystem 0elated "inallin.....................................*.,a.* 4eletion of P4P 2ontetCP" bearer used to transport &M" "&P sinallin.............................................

.*.* The >o" re?uirements for an &M 2' subsystem session.................................................................................*.*.+ General........................................................................................................................................................*.*., 0elation of &M" media components and P4P contetsCP" bearers carryin &M" media........................*.3 &nteraction between GP0"CP" >o" and session sinallin...........................................................................*.3.+ General........................................................................................................................................................*.3., 0esource 0eservation with Policy and 2harin 2ontrol.........................................................................

.*.: 'etwor# initiated session release ; P;2"29 initiated.......................................................................................*.:.+ General........................................................................................................................................................*.:., 'etwor# initiated session release ; P;2"29 initiated after loss of radio coverae....................................

.3 /ddress and identity manaement concepts........................................................................................3., 4erivin &M" identifiers from the 5"&M........................................................................................................

.: Aoid....................................................................................................................................................

.= &P version interwor#in in &M"..........................................................................................................

.- 5sae of '/T in GP0"CP"..............................................................................................................

.@ 0etrieval of 'etwor# Provided 7ocation &nformation in GP0"CP"..................................................

.D Georaphical &dentifier.......................................................................................................................

.E "upport for Pain policy differentiation for &M" services................................................................

Annex + (Informative): 'o$tin% !$,!e$ent re$e!t! t#ro$%# t#e -CC+..................................

Annex & (Normative): 'eference Arc#itect$re and proced$re! w#en t#e NA i! invo"ed

,etween t#e /E and t#e I* domain........................................................

G., General...............................................................................................................................................G.,., General re?uirements.................................................................................................................................

G.* 0eference models...............................................................................................................................G.*., &M";/7G and &M" /ccess Gateway model..............................................................................................

G.*.* &2 and Outbound reference model...........................................................................................................

G.3 'etwor# elements for employin the &M";/7G and &M" /ccess Gateway.......................................G.3., 0e?uired functions of the P;2"29..................................................................................................................

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G.3.* 0e?uired functions of the &M" /ccess Gateway.............................................................................................G.3.3 &? reference point.............................................................................................................................................

G.: Procedures for employin the &M";/7G and &M" /ccess Gateway..................................................G.:., General.............................................................................................................................................................G.:.* '/T detection in P;2"29...............................................................................................................................G.:.3 "ession establishment procedure.....................................................................................................................

G.:.: "ession release procedure................................................................................................................................G.:.= "ession modification........................................................................................................................................G.:.- Media forwardin in the &M" /ccess Gateway...............................................................................................

G.= 'etwor# elements for employin '/T Traversal for &2 and Outbound...........................................G.=., General re?uirements.......................................................................................................................................G.=.* &2...................................................................................................................................................................G.=.*., Overview....................................................................................................................................................

G.=.*.* 0e?uired functions of the 5.....................................................................................................................G.=.*.3 0e?uired functions of the "T5' relay server............................................................................................G.=.*.: 0e?uired functions of the "T5' server.....................................................................................................G.=.3 Outbound.........................................................................................................................................................G.=.3., Overview....................................................................................................................................................

G.=.3.* 0e?uired functions of the P;2"29............................................................................................................G.=.3.3 0e?uired functions of the ";2"29............................................................................................................G.=.3.: 0e?uired functions of the 5.....................................................................................................................

G.- Procedures for employin &2 and Outbound....................................................................................G.-., 9low establishment procedures.......................................................................................................................G.-.* "ession establishment procedures...................................................................................................................G.-.3 "ession release procedures..............................................................................................................................G.-.: "ession modification procedures.....................................................................................................................G.-.= Policy and 2harin 2ontrol procedures.........................................................................................................G.-.- 4etection of '/T Traversal support................................................................................................................

G.-.@ Procedures at other &M" entities processin "4P...........................................................................................

Annex 0 (Informative): Example 0 deploment..........................................................................

Annex I (Normative): Border Control +$nction!..........................................................................

&., General...............................................................................................................................................

&.* Overall architecture............................................................................................................................

&.3 1order 2ontrol 9unctions...................................................................................................................&.3., &P version interwor#in...................................................................................................................................&.3.,., Oriinatin "ession 9lows towards &Pv: "&P networ#..............................................................................&.3.,.* Terminatin "ession 9lows from &Pv: "&P networ#..................................................................................&.3.* 2onfiuration independence between operator networ#s................................................................................&.3.3 Transcodin "upport for &nterwor#in............................................................................................................

&.3.3., General.......................................................................................................................................................&.3.3.* "ession 9lows.............................................................................................................................................&.3.3.*., Proactive transcodin support..............................................................................................................&.3.3.*.* 0eactive transcodin support...............................................................................................................

Annex 1 (Informative): Dnamic /!er Allocation to t#e Application erver!...............................

H., General...............................................................................................................................................

H.* 0epresentative /"..............................................................................................................................H.*., 2oncept of 0epresentative /".........................................................................................................................

H.*.* Procedures related to 0epresentative /".........................................................................................................

H.3 4ynamic assinment of /" by ";2"29 cachin................................................................................H.3., 2oncept of 4ynamic assinment of /" by ";2"29 cachin..........................................................................H.3.* Procedures related to 4ynamic assinment of /" by ";2"29 cachin..........................................................

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Annex 2 (Normative): Inter-I* Networ" to Networ" Interface ,etween two I* CN

!$,!!tem networ"!....................................................................................

%., General...............................................................................................................................................

%.* Overall architecture............................................................................................................................

Annex 3 (Normative): A!pect! for $!e of Common I* in 4&PP5 !!tem!................................

7., General...............................................................................................................................................

7.* 4efinitions..........................................................................................................................................7.*., o" related concepts when usin 3GPP* Pac#et 4ata "ubsystem.....................................................

7.= &P version support in &M" when usin 3GPP* Pac#et 4ata "ubsystem..............................................

7.- /ddress and identity manaement concepts.......................................................................................7.-., 4erivin &M" identifiers..................................................................................................................................

7.@ 0elationship to 3GPP Generic 5ser Profile (G5P).............................................................................

Annex * (Informative): I* 3ocal Brea"o$t...................................................................................

M., P;2"29 located in visited networ#.....................................................................................................M.,., 4escription.......................................................................................................................................................M.,.,.+ General.......................................................................................................................................................

M.,.,., /rchitecture................................................................................................................................................M.,.,.* 9low for oriinatin session.......................................................................................................................

M.* P;2"29 located in home networ#.......................................................................................................

M.*., 4escription.......................................................................................................................................................M.*.,.+ General.......................................................................................................................................................M.*.,., /rchitecture................................................................................................................................................M.*.,.* 9low for oriinatin session.......................................................................................................................M.*.* /ddress assinment.........................................................................................................................................

M.*.3 &Pv: ; &Pv- interwor#in.................................................................................................................................M.*.: '/T traversal...................................................................................................................................................

M.3 P;2"29 located in visited networ# and with AP7M' loopbac# possibility.......................................M.3., 4escription.......................................................................................................................................................M.3.,., General.......................................................................................................................................................M.3.,.* /rchitecture................................................................................................................................................M.3.,.3 9low for oriinatin session with AP7M' routin...................................................................................

M.3.,.: 9low for oriinatin session with

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P.,.3 "ession flows...................................................................................................................................................P.,.3., General.......................................................................................................................................................P.,.3.* Proactive transcodin invocation...............................................................................................................P.,.3.3 0eactive transcodin invocation................................................................................................................

Annex 7 (Normative): 8ptimal media ro$tin%...............................................................................

>., General...............................................................................................................................................

>.* Procedures and flows..........................................................................................................................>.*., "4P etension..................................................................................................................................................>.*.* General &M";/7G procedures........................................................................................................................>.*.3 2ommon flows................................................................................................................................................>.*.3., &M";/7G allocates a TrGB......................................................................................................................

>.*.3.* &M";/7G does not allocate a TrGB.........................................................................................................>.*.3.3 &M";/7G bypasses its TrGB and one or more prior TrGBs...................................................................>.*.3.: &M";/7G bypasses its TrGB usin secondary realm from prior &M";/7G............................................>.*.3.= &M";/7G bypasses one or more prior TrGBs usin a secondary realm..................................................>.*.3.- &M";/7G bypasses TrGBs performin '/T traversal............................................................................>.*.= 9lows with transcodin....................................................................................................................................

>.*.=., Proactive transcodin where transcodin is re?uired................................................................................>.*.=.* Proactive transcodin where transcodin not re?uired..............................................................................>.*.=.3 &M";/7G bypasses prior unre?uired proactive transcoder.......................................................................>.*.=.: &M";/7G bypasses its TrGB and prior unre?uired proactive transcoder................................................>.*.=.= &M";/7G replaces prior proactive transcoder...........................................................................................>.*.=.- Proactive transcodin without resource reservation..................................................................................

>.*.=.@ 0eactive transcodin..................................................................................................................................

>.3 2harin.............................................................................................................................................

Annex ' (Informative): Di!tri,$tion of Networ" Provided 3ocation Information wit#in I*

......................................................................................................................

0., General...............................................................................................................................................

0.* "ession stablishmentCModification at Mobile Oriination ; 7ocation &nfo in 0e?uest.....................

0.3 "ession stablishmentCModification at Mobile Oriination ; 7ocation &nfo in 0esponse...................

0.: "ession stablishmentCModification at Mobile Termination...............................................................

0.= "ession stablishmentCModification ; 7ocation &nformation 4istributed by &M" /"........................

0.- "ession 0elease..................................................................................................................................

Annex (Normative): B$!ine!! r$n"in%......................................................................................

"., General...............................................................................................................................................

".* &P;P1Is usin static mode 1usiness Trun#in...................................................................................".*.,

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Annex (Normative): IP-Connectivit Acce!! Networ" !pecific concept! w#en $!in%

r$!ted 93AN (9AN) to acce!! I*....................................................

T.+ General...............................................................................................................................................

T., 0etrieval of 'etwor# Provided 7ocation &nformation in TB/' access.............................................

Annex / (Normative): 9e,'C acce!! to I* - networ"-,a!ed arc#itect$re............................

5., Overview............................................................................................................................................5.,.+ General.............................................................................................................................................................5.,., /ssumptions....................................................................................................................................................5.,.* /rchitecture and reference model....................................................................................................................5.,.3 9unctional entities............................................................................................................................................

5.,.3., B&2 (Beb0T2 &M" 2lient).......................................................................................................................5.,.3.* BB"9 (Beb0T2 Beb "erver 9unction)..................................................................................................5.,.3.3 eP;2"29 (P;2"29 enhanced for Beb0T2)..............................................................................................5.,.3.: e&M";/GB (&M" /ccess GateBay enhanced for Beb0T2)....................................................................5.,.3.= B/9 (Beb0T2 /uthorisation 9unction)...................................................................................................5.,.: 0eference points..............................................................................................................................................

5.,.:., B, (5 to BB"9)....................................................................................................................................5.,.:.* B* (5 to eP;2"29).................................................................................................................................5.,.:.3 &? (eP;2"29 to e&M";/GB).....................................................................................................................5.,.:.: B3 (5 to e&M";/GB)............................................................................................................................5.,.:.= B: (BB"9 to B/9).................................................................................................................................5.,.= Media plane protocol architecture...................................................................................................................

5.,.=.+ General.......................................................................................................................................................5.,.=., Protocol architecture for M"0P.................................................................................................................5.,.=.* Protocol architecture for 192P..................................................................................................................5.,.=.3 Protocol architecture for T.,:+..................................................................................................................5.,.=.: Protocol architecture for Aoice and Aideo.................................................................................................

5.* Procedures..........................................................................................................................................5.*., 0eistration......................................................................................................................................................5.*.,., &ntroduction................................................................................................................................................

5.*.,.* B&2 reistration of individual Public 5ser &dentity usin &M" authentication........................................5.*.,.3 B&2 reistration of individual Public 5ser &dentity based on web authentication...................................5.*.,.: B&2 reistration of individual Public 5ser &dentity from a pool of Public 5ser &dentities......................5.*.* "ession manaement related procedures.........................................................................................................5.*.3 4e;0eistration procedures.............................................................................................................................5.*.: Media plane Optimi!ation...............................................................................................................................

Annex V (Normative): IP-Connectivit Acce!! Networ" !pecific concept! w#en $!in%

/ntr$!ted 93AN to acce!! I*................................................................

A., General...............................................................................................................................................

A.* 5 Provided /ccess &nformation in 5ntrusted B7/' access...........................................................

Annex V (Informative): C#an%e #i!tor............................................................................................

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*"e4"d

This Technical "pecification has been produced by the 3rd Generation Partnership Project (3GPP).

The contents of the present document are subject to continuin wor# within the T"G and may chane followin formalT"G approval. "hould the T"G modify the contents of the present document it will be re;released by the T"G with anidentifyin chane of release date and an increase in version number as followsJ

Aersion .y.!

whereJ

the first diitJ

, presented to T"G for informationK

* presented to T"G for approvalK

3 or reater indicates T"G approved document under chane control.

y the second diit is incremented for all chanes of substance i.e. technical enhancements correctionsupdates etc.

! the third diit is incremented when editorial only chanes have been incorporated in the document.

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1 S"pe

This document defines the stae;* service description for the &P Multimedia 2ore 'etwor# "ubsystem (&M") whichincludes the elements necessary to support &P Multimedia (&M) services. &T5;T 0ecommendation &.,3+ L: describes a

three;stae method for characterisation of telecommunication services and &T5;T 0ecommendation >.-= L3 definesstae * of the method.

This document does not cover the /ccess 'etwor# functionality ecept as they relate to provision of &M services theseaspects are covered in the normative /nne .

This document identifies the mechanisms to enable support for &P multimedia applications. &n order to alin &Pmultimedia applications wherever possible with non;3GPP &P applications the eneral approach is to adopt non;3GPPspecific &P based solutions.

2 $e7eee%

The followin documents contain provisions which throuh reference in this tet constitute provisions of the presentdocument.

0eferences are either specific (identified by date of publication edition number version number etc.) or

non;specific.

9or a specific reference subse?uent revisions do not apply.

9or a non;specific reference the latest version applies. &n the case of a reference to a 3GPP document (includin

a G"M document) a non;specific reference implicitly refers to the latest version of that document in the sameRelease as the present document.

L, 3GPP T" *3.++*J N'etwor# /rchitectureN.

L* 22&TT 0ecommendation .,-:J N'umberin plan for the &"4' eraN.

L3 22&TT 0ecommendation >.-=J NMethodoloy F "tae * of the method for the characterisation ofservices supported by an &"4'N.

L: &T5 0ecommendation &.,3+J NMethod for the characteri!ation of telecommunication servicessupported by an &"4' and networ# capabilities of an &"4'N.

L= Aoid.

L- Aoid.

L@ 3GPP T" *3.**,J N/rchitectural 0e?uirementsN.

LD 3GPP T" **.**DJ N"ervice re?uirements for the &P multimedia core networ# subsystemN.

LE 3GPP T" *3.*+@J Nnd;to;end >o" concept and architectureN.

L,+ Aoid.

L,+a 3GPP T" *:.**EJ N&P Multimedia 2all 2ontrol based on "&P and "4PK "tae 3N.

L,, Aoid.

L,,a 3GPP T" *E.*+@J NPolicy control over Go interfaceN.

L,* &T9 092 3*-,J N"&PJ "ession &nitiation ProtocolN.

L,3 &T9 092 3ED-J N5niform 0esource &dentifiers (50&)J Generic "yntaN.

L,: &T9 092 :*D*J NThe 'etwor# /ccess &dentifierN.

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L,= &T9 092 3E--J NThe tel 50& for Telephone 'umbersN.

L,- &T9 092 3@-, (/pril *++:)J NThe .,-: to 5niform 0esource &dentifiers (50&) 4ynamic

4eleation 4iscovery "ystem (444") /pplication ('5M)N.

L,-a &T9 092 :E:,J NPrivacy tensions for "tateless /ddress /utoconfiuration in &Pv-N.

L,@ &T5 0ecommendation G.@,,J NPulse code modulation (P2M) of voice fre?uenciesN.

L,D &T5 0ecommendation

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L:* &T9 092 3D:,J N2aller Preferences for the "ession &nitiation Protocol ("&P)N.

L:3 &T9 092 3:*DJ N"ession &nitiation Protocol ("&P) tension for &nstant MessainN.

L:: &T9 092 3*-3J N"ession &nitiation Protocol ("&P)J 7ocatin "&P "erversN.

L:= &T9 092 =*:=J N&nteractive 2onnectivity stablishment (&2)J / Protocol for 'etwor# /ddress

Translator ('/T) Traversal for OfferC/nswer ProtocolsN.

L:- &T9 092 =@--J NTraversal 5sin 0elays around '/T (T50')J 0elay tensions to "essionTraversal 5tilities for '/T ("T5')N.

L:@ &T9 092 =3DEJ N"ession Traversal 5tilities for '/T ("T5')N.

L:D &T9 092 =-*-J NManain 2lient &nitiated 2onnections in the "ession &nitiation Protocol ("&P)N.

L:E &T9 092 =-*@J NObtainin and 5sin Globally 0outable 5ser /ent 50&s (G055s) in the"ession &nitiation Protocol ("&P)N.

L=+ &T9 092 =-*DJ N0eistration vent Pac#ae tension for "ession &nitiation Protocol ("&P)Globally 0outable 5ser /ent 50&s (G055s)N.

L=, &T9 092 :@D@J N'etwor# /ddress Translation ('/T) 1ehavioural 0e?uirements for 5nicast54PN.

L=* 3GPP T" *3.*@EJ N2ombinin 2ircuit "witched (2") and &P Multimedia "ubsystem (&M")servicesK "tae *N.

L=3 3GPP T" **.,@3J N&M" Multimedia Telephony "ervice and supplementary servicesK "tae ,N.

L=: 3GPP T" *3.*+3J NPolicy and 2harin 2ontrol architectureN.

L== 3GPP T" *3.,+@J N>uality of "ervice (>o") concept and architectureN.

L=- 3GPP T" *3.*+:J N"upport of "hort Messae "ervice ("M") over eneric 3GPP &nternet Protocol

(&P) accessN.

L=@ &T9 092 :@-EJ N&/'/ 0eistration for an numservice 2ontainin Public "witched Telephone'etwor# (P"T') "inalin &nformationN.

L=D 3GPP T" *3.,-@J N&P Multimedia "ubsystem (&M") emerency sessionsN.

L=E 3GPP T" *E.333J NMultimedia 0esource 9unction 2ontroller (M092) ; Multimedia 0esource9unction Processor (M09P) Mp &nterfaceK "tae 3N.

L-+ 3GPP* I."++,,J Ncdma*+++ Bireless &P 'etwor# "tandardN.

L-, 3GPP* 2."+++,;4J N&ntroduction to cdma*+++ "pread "pectrum "ystems ; 0evision 4N.

L-* 3GPP* 2."++*:;/J Ncdma*+++

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L@, 3GPP T" *3.*,DJ N&P Multimedia (&M) session handlinK &M call modelK "tae *N.

L@* &T9 092 3*-:J N/n OfferC/nswer Model with "ession 4escription ProtocolN.

L@3 3GPP T" *3.333J NMultimedia 0esource 9unction 2ontroller (M092) ; Multimedia 0esource9unction Processor (M09P) Mp interfaceJ Procedures 4escriptionsN.

L@: 3GPP T" *3.33:J N &M" /pplication 7evel Gateway (&M";/7G) ; &M" /ccess Gateway (&M";/GB) interfaceJ Procedures 4escriptionsN.

L@= 3GPP T" *E.,-*J N&nterwor#in between the &M 2' subsystem and &P networ#sN.

L@- 3GPP T" *-.,,:J N&P Multimedia "ubsystem (&M")K Multimedia TelephonyK Media handlin andinteractionN.

L@@ 3GPP T" **.,=3J NMultimedia priority serviceN.

L@D Aoid.

L@E 3GPP T" *E.3*DJ N&P Multimedia (&M) "ubsystem "h &nterfaceK "inallin flows and messaecontentsN.

LD+ 3GPP T" *3.3D+J N&P Multimedia "ubsystem (&M")K &M" 0estoration ProceduresN.

LD, 3GPP T" *:.=*=J N1usiness trun#inK /rchitecture and functional descriptionN.

LD* 3GPP T" *3.:+*J N/rchitecture nhancements for non;3GPP accessesN.

LD3 3GPP T" 33.3*DJ N&P Multimedia (&M) "ubsystem media plane securityN

LD: &T9 4raft draft;ietf;rtcweb;overview;,3 NOverviewJ 0eal Time Protocols for 1rower;based/pplicationsN.

ditor$s noteJ The above document cannot be formally referenced until it is published as an 092.

LD= B32J NBeb0T2 ,.+J 0eal;time 2ommunication 1etween 1rowsersN B32 Bor#in 4raft ,+"eptember *+,3 httpJCCwww.w3.orCT0C*+,3CB4;webrtc;*+,3+E,+C.

ditor$s noteJ The above document cannot be formally referenced until it is published as a candidaterecommendation.

LD- B32J N2ross;Oriin 0esource "harinN B32 Proposed 0ecommendation += 4ecember *+,3httpJCCwww.w3.orCT0C*+,3CP0;cors;*+,3,*+=C.

LD@ &T5;T 0ecommendation T.,:+J NProtocol for multimedia application tet conversationN.

LDD &T9 092 -:==J NThe Beb"oc#et ProtocolN.

LDE &T9 092 @,,DJ NThe Beb"oc#et Protocol as a Transport for the "ession &nitiation Protocol

("&P)N.

LE+ &T9 092 :=@,J N9ramin 0eal;time Transport Protocol (0TP) and 0TP 2ontrol Protocol (0T2P)Pac#ets over 2onnection;Oriented TransportN.

LE, 3GPP T" *:.-,+J N2ommunication

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3 e7iiti"%, %9m"l% ad ae:iati"%

3.1 e7iiti"%

0efer to T" *3.++* L, for the definitions of some terms used in this document.

9or the purposes of the present document the terms and definitions iven in T0 *,.E+= L-D and the followin apply. /term defined in the present document ta#es precedence over the definition of the same term if any in T0 *,.E+= L-D.

9or the purposes of the present document the followin terms and definitions iven in T" *3.++3 L*: applyJ

Di!tinct P$,lic ervice Identit

P$,lic /!er Identit

9ildcarded P$,lic /!er Identit

9ildcarded ervice /!er Identit

Alia! P$,lic /!er Identitie!:/ set of Public 5ser &dentities that belon to the same alias roup as specified inT" *E.**D L3+.

A3&: /pplication 7evel Gateway (/7G) is an application specific functional entity that allows communicationbetween disparate address realm or &P versions e.. an &Pv- node to communicate with an &Pv: node and vice versawhen certain applications carry networ# addresses in the payloads li#e "&PC"4P. '/(P)T;PT or '/(P)T is applicationunaware whereas /7Gs are application specific translation entities that allow a host runnin an application to

communicate transparently with another host runnin the same application but in a different &P version or &P addressrealm. "ee &T9 092 *--3 L3: for more details.

9or &M" an &M" /7G provides the necessary application function for "&PC"4P protocols in order tocommunicate between different address realms or &P versions e.. &Pv- and &Pv: "&P applications.

Di!tinct P$,lic /!er Identit:used in relation to wildcarded Public 5serC"ervice &dentities to denote an eplicitlyprovisioned Public 5serC"ervice &dentity. "ee more details in T" *3.++3 L*:.

Entr point:&n the case that border control concepts are to be applied in an &M 2' subsystem then these are to beprovided by capabilities within the &129 and the &129 acts as an entry point for this networ# (instead of the &;2"29).

&n this case the &129 and the &;2"29 can be co;located as a sinle physical node. &f border control concepts are notapplied then the &;2"29 is considered as an entry point of a networ#. &f the P;2"29 is in the home networ# then the&;2"29 is considered as an entry point for this document.

Exit point:&f operator preference re?uires the application of border control concepts then these are to be provided bycapabilities within the &129 and re?uests sent towards another networ# are routed via a local networ# eit point

(&129) which will then forward the re?uest to the other networ# (discoverin the entry point if necessary).

IP-Connectivit Acce!! Networ":refers to the collection of networ# entities and interfaces that provides theunderlyin &P transport connectivity between the 5 and the &M" entities. /n eample of an N&P;2onnectivity /ccess'etwor#N is GP0".

B$!ine!! tr$n"in%:as defined in T" *:.=*= LD,.

$,!cri,er: / "ubscriber is an entity (comprisin one or more users) that is enaed in a "ubscription with a serviceprovider. The subscriber is allowed to subscribe and unsubscribe services to reister a user or a list of user authori!ed toenjoy these services and also to set the limits relative to the use that users ma#e of these services.

Inter-I* Networ" to Networ" Interface: The interface which is used to interconnect two &M 2' subsystemnetwor#s. This interface is not constrained to a sinle protocol.

Networ" Addre!! ran!lation (NA(P)):method by which &P addresses are mapped from one roup to another

transparently to end users. 'etwor# /ddress Port Translation or '/(P)T is a method by which many networ# addressesand their T2PC54P (Transmission 2ontrol ProtocolC5ser 4ataram Protocol) ports are translated into a sinle networ#address and its T2PC54P ports. "ee 092 3+** L-= for further details.

NA-PNAP-P:'/T;PT uses a pool of lobally uni?ue &Pv: addresses for assinment to &Pv- nodes on a dynamicbasis as sessions are initiated across the &P version boundaries. '/T;PT binds addresses in &Pv- networ# with addresses

in &Pv: networ# and vice versa to provide transparent routin between the two &P domains without re?uirin any

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chanes to end points li#e the 5. '/T;PT needs to trac# the sessions it supports and mandates that inbound andoutbound data for a specific session traverse the same '/T;PT router.

'/PT;PT provides additional translation of transport identifier (e.. T2P and 54P port numbers &2MP ?ueryidentifiers). This allows the transport identifiers of a number of &Pv- hosts to be multipleed into the transportidentifiers of a sinle assined &Pv: address. "ee &T9 092 *@-- L33 for more details.

ran!port addre!!J / uni?ue identifier of transport;layer address i.e. a combination of a networ# address protocolidentifier and port number. 9or eample an &P address and a 54P port.

I* application:/n &M" application is an application that uses an &M" communication service(s) in order to provide aspecific service to the end;user. /n &M" application utilises the &M" communication service(s) as they are specifiedwithout etendin the definition of the &M" communication service(s).

I* application reference:/n &M" application reference is the means by which an &M" communication serviceidentifies an &M" application.

I* comm$nication !ervice:/n &M" communication service is a type of communication defined by a servicedefinition that specifies the rules and procedures and allowed medias for a specific type of communication and thatutilises the &M" enablers.

I* comm$nication !ervice identifier:/n &M" communication service identifier uni?uely identifies the &M"communication service associated with the particular &M" re?uest.

I*C: &M" 2redentials as defined in T0 *,.E+= L-D.

I* ena,ler:/n &M" enabler is a set of &M" procedures that fulfils specific function. /n &M" enabler may be used inconjunction with other &M" enablers in order to provide an &M" communication service.

In!tance identifier:/n identifier that uni?uely identifies a specific 5 amonst all other 5s reistered with the samePublic 5ser &dentity.

3ocal ervice N$m,er:/ local service number is a telephone number in non international format. / local servicenumber is used to access a service that may be located in the home networ# of the user (home local service number) or

the roamed networ# of the user (eo;local service number).

&eo-local !ervice n$m,er:/ local service number that is used to access a service in the roamed networ# (a localservice where the subscriber is located).

0ome local !ervice n$m,er:/ local service number is used to access a service that is located in the home networ# ofthe user.

IP +low:5nidirectional flow of &P pac#ets with the followin propertiesJ

; same source &P address and port numberK

; same destination &P address and port numberK

; same transport protocol (port numbers are only applicable if used by the transport protocol).*edia +low:One or more &P flows carryin a sinle media instance e.. an audio stream or a video stream. &n thecontet of this specification the term Media 9low is used instead of &P 9low reardless of whether the actual &P pac#et

corresponds to media plane information (e.. audio 0TP flow) or control sinallin (e.. 0T2P or "&P "inallin).

*P:1ased on T" **.,=3 L@@. Multimedia Priority "ervice allows authori!ed users to obtain and maintain radio andnetwor# resources with priority also durin national security or emerency situations when P7M' conestion mayoccur.

*P !e!!ion:/ session (e.. voice video data session) for which priority treatment is applied for allocatin andmaintainin radio and networ# resources.

*P-!$,!cri,ed /E:/ 5 havin a 5"&M with MP" subscription.

ervice /!er:/ccordin to T" **.,=3 L@@.

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/N:"imple Traversal of 54P Throuh '/T ("T5') provides a tool#it of functions. These functions allow entitiesbehind a '/T to learn the address bindins allocated by the '/T to #eep those bindins open and communicate withother "T5';aware devices to validate connectivity. "ee 092 =3DE L:@ for further details.

/N 'ela:&s a usae of "T5' that allows a client to re?uest an address on the "T5' server itself so that the"T5' server acts as a relay. "ee &T9 092 =@-- L:- for further details.

/N 2eep-alive:&s a usae of "T5' to #eep '/T bindins open.

8$t,o$nd:Manain 2lient &nitiated 2onnections in the "ession &nitiation Protocol (Outbound) defines behaviours for5ser /ents reistrars and proy servers that allow re?uests to be delivered on eistin connections established by the5ser /ent. "ee 092 =-*- L:D for further details.

Preferred Circ$it Carrier election:/n &M" service that allows the subscriber to select a lon distance circuit carrier

per call when diallin a call oriination.

Preferred Circ$it Carrier Acce!!:/n &M" service that allows a specific lon distance circuit carrier to be selected fora lon distance call.

IP-*-&9 (IP !#ort me!!a%e %atewa):/n &P;"M;GB is an /" providin the support of "hort Messae "ervice of

the &M" domain. "ee more details in T" *3.*+: L=-.&eo%rap#ical Identifier:/ Georaphical &dentifier identifies a eoraphical area within a country or territory. "eemore details in clause .D.

3.2 S9m"l%

9or the purposes of the present document the followin symbols applyJ

2r 0eference Point between an /" and an M092 for media control.2 0eference Point between a 2"29 and an

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3.3 'e:iati"%

9or the purposes of the present document the abbreviations iven in T0 *,.E+= L-D and the followin apply. /nabbreviation defined in the present document ta#es precedence over the definition of the same abbreviation if any inT0 *,.E+= L-D.

/P& /pplication Proram &nterface/" /pplication "erver 12"M 1asic 2all "tate Model1G 1order Gateway1G29 1rea#out Gateway 2ontrol 9unction1" 1earer "ervice2/M7 2ustomised /pplication Mobile nhanced 7oic

2/P 2amel /pplication Part240 2harin 4ata 0ecord2' 2ore 'etwor# 2" 2ircuit "witched2"29 2all "ession 2ontrol 9unction2" 2/M7 "ervice nvironment

4

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P;2"29 Proy;2"29P22 Policy and 2harin 2ontrolP29 Policy and 2harin nforcement 9unctionP209 Policy and 2harin 0ules 9unction

P4' Pac#et 4ata 'etwor# P4P Pac#et 4ata Protocol e.. &P

P;G055 Public Globally 0outable 5ser /ent 50&P7M' Public 7and Mobile 'etwor# P"& Public "ervice &dentityP"T' Public "witched Telephone 'etwor#

>o" >uality of "ervice0/1 0adio /ccess 1earer 092 0e?uest for 2omments"2" "ervice 2apability "erver ";2"29 "ervin;2"29"4P "ession 4escription Protocol

"G"' "ervin GP0" "upport 'ode"79 "ubscription 7ocator 9unction""9 "ervice "witchin 9unction

""@ "inallin "ystem @"&M "ubscriber &dentity Module

"&P "ession &nitiation Protocol";GB "inallin GatewayT/" Telephony /pplication "erver T;G055 Temporary Globally 0outable 5ser /ent 50&T

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9iure :.+ below represents the &M" reference architecture includin interfaces towards leacy networ#s and other &Pbased multimedia systems. 4etails of the roles of these nodes are described in clauses :.- :.@ and :.@a.

'OT ,J "ome entities defined as part of the &M" "ubsystem can also be used by other subsystems.

'OT *J The &ci and &!i reference points are only applicable for &P Multimedia 'etwor#s that are &M" subsystems.

/i!ure ,%)0 #eference Architecture of the IP Multimedia 1ore 2etor4 Subsystem

/ description of the functional entities can be found in T" *3.++* L,.

/.1 $elati"%&ip t" S d"mai ad t&e #P-"eti:it9 'e%%+et4"!

The &P multimedia subsystem utili!es the &P;2/' to transport multimedia sinallin and bearer traffic. &P;2/'s thatmaintain the service while the terminal moves hide these moves from the &P multimedia subsystem.

The &P multimedia subsystem is independent of the 2" domain althouh some networ# elements may be common withthe 2" domain. This means that it is not necessary to deploy a 2" domain in order to support an &P multimedia

subsystem based networ#.

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/.2 #MS %e:ie% "ept%

/.2.1 ;"me-et4"! a%ed %e:ie%

/.2.1.1 Supp"t "7 'MEL " #+&t shall be possible for an operator to offer access to services based on the 2" or &' "ervice nvironment for its &M2' subsystem subscribers. &t should be noted that there is no re?uirement for any operator to support 2/M7 or &'services for their &M 2' subsystem subscribers or for inbound roamers.

9or more information refer to clause :.*.:.

/.2.1.2 Supp"t "7

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/.2.2 Supp"t "7 ume% i "-iteati"al 7"mat i t&e #MS

Phone or telephone numbers which are not in the international format can allow the access of the visited services (localservice numbers) and the access of numbers in a local addressin plan. "ince numbers in non;international format are

widely used in leacy fied and mobile 2" networ#s the seamless co;operation with these networ#s re?uire the supportof numbers in non;international format (includin local service numbers) in the &M". &t is up to the operator$s policy

when and which type of numbers in non;international format can be used. &n the rest of this clause the term $visitedaccess networ#$ is used to indicate the networ# in which the user is physically located. &n case of GP0" access this isthe AP7M'. &n case of other access types this is most probably the &P;2/' provider.

The use of numbers in non;international format includin local service numbers shall be provided in the followinmannerJ

,. &t shall be possible for the

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5

P;2"29

"ervin

2"29

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The use of additional elements to be included in the "&P sinallin path is optional. "uch additional elements mayprovide functions as described in clause :.,: and /nne &.

/.2./ #P multimedia Su%9%tem Se:ie "t"l #te7ae (#S)

The &"2 interface is between the "ervin 2"29 and the service platform(s).

/n /pplication "erver (/") offerin value added &M services resides either in the user$s home networ# or in a thirdparty location. The third party could be a networ# or simply a stand;alone /".

The "ervin;2"29 to /" interface is used to provide services residin in an /". Two cases were identifiedJ

; "ervin;2"29 to an /" in

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,. The &"2 interface shall be able to convey charin information as per T" 3*.*:+ L*= and T" 3*.*-+ L*-.

*. The protocol on the &"2 interface shall allow the ";2"29 to differentiate between "&P re?uests on Mw Mm and

M interfaces and "&P 0e?uests on the &"2 interface.

/i!ure ,%30 'oid

1esides the 2 interface the ";2"29 supports only one standardised protocol for service control which deleates

service eecution to an /pplication "erver. The protocol to be used on the &"2 interface shall be "&P (as defined by&T9 092 3*-, L,* other relevant &T9 092$s and additional enhancements introduced to support 3GPPs needs onthe Mw Mm M interfaces).

The notion of a N"&P leN used throuhout this specification is identical to the notion of a call le which is the same as a"&P dialo defined by &T9 092 3*-, L,*. The same "&P le that is received by the ";2"29 on the Mw Mm and M

interfaces is sent on the &"2 interface. The same "&P le that is received by the ";2"29 on the &"2 interface is sent onthe Mw Mm and M interfaces.

2oncernin the relationship between the "&P les of the &"2 interface and the "&P les of the Mw Mm and Minterfaces the ";2"29 acts as a "&P proy as shown in 9iures :.3a F :.3e below.

9iures :.3a;:.3e below depict the possible hih;level interactions envisioned between the ";2"29 and the /pplication"erver.

S+1S1/

ApplicationServer

S#P le >1

S#P le >1

*"m ?T" =all-# @

*"m ?T" =all-# @

/i!ure ,%3a0 Application Server actin! as terminatin! 8A9 or redirect server

S+1S1/

ApplicationServer

S#P le >1

S#P le >1

*"m ?T" =all-# @

*"m ?T" =all-# @

/i!ure ,%3b0 Application Server actin! as ori!inatin! 8A

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S+1S1/

ApplicationServer

S#P le >1

S#P le >1

*"m ?T" =all-# @

*"m ?T" =

all-# @

S#P le >1*"m ?T" =all-# @

S#P le >1

*"m ?T" =all-# @

/i!ure ,%3c0 Application Server actin! as a SIP pro7y

S+1S1/

ApplicationServer

S#P le >2

S#P le >2

*"m PT" Aall-# $

*"m PT" Aall-# $

S#P le >1*"m ?T" =all-# @

S#P le >1

*"m ?T" =all-# @

/i!ure ,%3d0 Application Server performin! 3rdparty call control

+S#P le >1

*"m ?T" =all-# @

S#P le >1

*"m ?T" =all-# @

/i!ure ,%3e0 A SIP le! is passed throu!h the S+1S1/ ithout Application Server involvement

/.2./a ;SS t" %e:ie plat7"m #te7ae

The /pplication "erver ("&P /pplication "erver andCor the O"/ service capability server andCor &M;""9) maycommunicate to the

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3. The "h interface transports transparent data for e.. service related data user related information etc.&n this case the term transparent implies that the eact representation of the information is not understood by the

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/.2./ S-S* Se:ie "t"l M"del

'S-#L,M

Application Server

#LSM

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The definitions used in the model areJ

Com,ined I3* 83* Incomin%o$t%oin% 3e% tate *odel:Models the behaviour of an ";2"29 for handlin

"&P messaes on incomin and outoin session les. The 2ombined &CO7"M shall be able to store session stateinformation. &t may act on each le independently actin as a "&P Proy 0edirect "erver or 5ser /ent dependant onthe information received in the "&P re?uest the filter conditions specified or the state of the session.

&t shall be possible to split the application handlin on each le and treat each endpoint differently.

I3C* - Incomin% 3e% Control *odel:Models the behaviour of an ";2"29 for handlin "&P information sent to andreceived from an /" for an incomin session le. The &72M shall store transaction state information.

83C* - 8$t%oin% 3e% Control *odel:Models the behaviour of an ";2"29 for handlin "&P information receivedfrom and sent to an /" for an outoin session le. The O72M shall store transaction state information.

A-I3C* - Application erver Incomin% 3e% Control *odel:Models /" behaviour for handlin "&P informationfor an incomin le. The /";&72M shall store Transaction "tate and may optionally store "ession "tate dependin onthe specific service bein eecuted.

A-83C* - Application erver 8$t%oin% 3e% Control *odel:Models /" behaviour for handlin "&P information

for an outoin le. The /";O72M shall store Transaction "tate and may optionally store "ession "tate dependin onthe specific service bein eecuted.

/.2./ #-S* t" 'S e7eee p"it (Ma)

The Ma reference point is between the &nterroatin 2"29 and the service platform(s).

The &nterroatin;2"29 to /" reference point is used toJ

; forward "&P re?uests destined to a Public "ervice &dentity hosted by an /pplication "erver directly to the/pplication "erverK

; oriinate a session on behalf of a user or Public "ervice &dentity if the /" has no #nowlede of a " 2"29assined to that user or Public "ervice &dentity.

&t shall be possible for an /pplication "erver to oriinate a session on behalf of users or Public "ervice &dentities. &f the/" has no #nowlede of the servin ";2"29 for that user or Public "ervice &dentity such re?uests are forwarded to an&;2"29 and the & 2"29 shall perform reular oriinatin procedures for these re?uests.

"ession oriination re?uests on behalf of reistered and unreistered users shall be supported.

The Ma reference point shall be able to convey charin information accordin to T" 3*.*:+ L*= and T" 3*.*-+ L*-.

The protocol to be used on the Ma reference point shall be "&P (as defined by 092 3*-, L,* other relevant&T9 092s and additional enhancements introduced to support 3GPPs needs on the Mw Mm M reference points).

2oncernin the relationship between the "&P les of the Ma reference point and the "&P les of the Mw Mm and Mreference points the &;2"29 acts as a "&P proy as shown in 9iures :.3f and :.3 below.

9iures :.3f and :.3 below depict the possible hih;level interactions envisioned between the &;2"29 and the

/pplication "erver.

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/i!ure ,%3f0 I+1S1/ forardin! a SIP reo" re?uirement associated with an &M 2' subsystem session.

,. &ndependence between >o" sinallin and "ession 2ontrol

The selection of >o" sinallin and resource allocation schemes should be independent of the selectedsession control protocols. This allows for independent evolution of >o" control and the session control in the&M 2' subsystem.

*. 'ecessity for nd;to;nd >o" "inallin and 0esource ;/llocation

nd;to;end >o" indication neotiation and resource allocation durin the session set;up in the &M 2'subsystem should be enforced for those services and applications that re?uire >o" better than best;effort.

3. Aoid.

:. 0estricted 0esource /ccess at the &P 1" 7evel

/ccess to the resources and provisionin of >o" at &P 1" 7evel should be authenticated and authori!ed by

applyin appropriate >o" policies via the &P Policy 2ontrol element

=. 0estricted 0esource /ccess at the &P;2onnectivity /ccess 'etwor# (i.e. layer;*) 7evel

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/ccess to the resources and provisionin of >o" at the &P;2onnectivity /ccess 'etwor# 7evel should beauthenticated and authori!ed by usin eistin reistrationCsecurityC>o" policy control mechanisms of the&P;2/'.

-. 2o;ordination between "ession 2ontrol and >o" "inallinC0esource /llocation

a. &n establishin an &M" session it shall be possible for an application to re?uest that the resources needed forbearer establishment be successfully allocated before the destination user is alerted.

b. &n establishin an &M" session it shall be possible dependent on the application bein offered to prevent theuse of the bearer until the session establishment is completed.

c. &n establishin an &M" session it shall be possible for a terminatin application to allow the destination userto participate in determinin which bearers shall be established.

d. "uccessful bearer establishment shall include the completion of any re?uired end;to;end >o" sinallinneotiation and resource allocation.

e. &n establishin an &M" session it shall be possible to use already allocated bearer resources if theseresources fulfil the needs of the session. o" policy control mechanisms of the &P;2/'

may not allow to use already allocated bearer resources.The initiation of any re?uired end;to;end >o" sinallin neotiation and resource allocation processes atdifferent networ# sements shall ta#e place after the initiation and delivery of a session set;up re?uest.

@. The fficiency of >o" "inallin and 0esource /llocation

The se?uence of end;to;end >o" sinallin neotiation and resource allocation processes at differentnetwor# sements should primarily consider the delay in neotiatin end;to;end >o" and reservin resourcesthat contributes to the session set;up delay. Parallel or overlappin >o" neotiation and resource reservationshall be allowed where possible.

D. 4ynamic >o" 'eotiation and 0esource /llocation

2hanes (upradin or downradin) of >o" provided to an active &M" session shall be supported based oneither the re?uest from the &M application or the current networ# loads or lin# ?uality (e.. radio lin# ?uality).

&t shall be possible to maintain a resource allocation in ecess of the resources needed for current mediaflows (but within the restrictions imposed by points : and = above) in order to e.. switch to differentmedia flow characteristics without ris# of admission control failure.

E. Prevention of Theft of "ervice

The possibility for theft of service in the &M 2' subsystem shall be no hiher than that for the correspondinpac#et data and circuit switched services.

,+. Prevention of 4enial of "ervice

The system unavailability due to denial of service attac#s in the &M 2' subsystem shall be no reater thanthat for the correspondin pac#et data and circuit switched services.

/.2.6 A"S $eBuiemet% 7" #M + %u%9%tem %ialli

4ependin on the bearer establishment mode the 5 or the &P;2/' shall be able to establish a dedicated sinallin&P;2/' bearer for &M "ubsystem related sinallin or utili!e a eneral;purpose &P;2/' bearer for &M subsystemsinallin traffic.

The use of a dedicated sinallin &P;2/' bearer for &M "ubsystem related sinallin may provide enhanced >o" forsinallin traffic.

&f a dedicated sinallin &P;2/' bearer is to be used for &M "ubsystem related sinallin rules and restrictions may

apply to the bearer accordin to operator implementation. / set of capabilities shall be standardised to provide usereperience consistency and satisfy user epectation. The rules and restrictions on other capabilities beyond thestandardised set are confiured by the operator in the &P;2/'.

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To enable the described mechanism to wor# without re?uirin end;user interaction and under roamin circumstances itis a re?uirement for the 5 to be made aware of the rules and restrictions applied by the visited networ# operator. &fthere is no mechanism available for providin the information about the restrictions bac# to the 5 the available set ofrules and restrictions in this 0elease is the set of capabilities as defined below.

The dedicated sinallin &P;2/' bearer is subject to restrictions the capabilities to be applied are defined as followsJ

all messaes from the 5 that use a dedicated sinallin &P;2/' bearer shall have their destination restricted toJ; the P;2"29 assined for this 5 or to any one of the set of possible P;2"29s that may be assined to this 5.

; and towards 4

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/dditionally other networ#s outside the &M 2' "ubsystem are able to perform "&P for#in.

/.2..3 Supp"t 7" 7"!ed eBue%t%

5 and MG29 shall be ready to receive responses enerated due to a for#ed re?uest and behave accordin to theprocedures specified in &T9 092 3*-, L,* and in this clause.

The 5 and MG29 may accept or reject early dialoues from different terminations as described in&T9 092 3*-, L,* for eample if the 5 is only capable of supportin a limited number of simultaneous dialos.

5pon the reception of a first final *++ O% (for &'A&T) the 5 or MG29 shall ac#nowlede the *++ O%. &n additionthe 5 or MG29 may re?uire updatin the allocated resources accordin to the resources needed. &n case the 5 orMG29 receives a subse?uent *++ O% the 5 or MG29 shall ac#nowlede the dialoue and immediately send a 1Rto drop the dialo.

'OTJ 5pon the reception of a first final *++ O% (for &'A&T) the 5 or MG29 may terminate the earlydialoue as specified in &T9 092 3*-, L,*.

The 5 and MG29 may include preferences accordin to &T9 092 3D:, L:* in &'A&T$s indicatin that proiesshould not for# the &'A&T re?uest. The ";2"29 and /" should follow the preferences if included in the &'A&T

re?uest. On the terminatin side 5 and MG29 shall be able to rec