soft switch migration
TRANSCRIPT
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AT THE HEART OF THE CONVERGED NETWORK
Migration toSoftswitch Solutions
Paul BrittainProduct Manager, MetaSwitch
VON Europe 2003
London
June 11 th 2003
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AGENDA
Introduction
Migration Models Access or core network Gateways vs. full Softswitch Business view
Engineering challenges Firewalls/NAT hassles Reliability how big should a Softswitch go?
Philosophy!
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INTRODUCTIONS
Paul Brittain Product Manager, MetaSwitch Responsible for worldwide product management and
European Sales
MetaSwitch MetaSwitch VP3500 Next Generation Class 5 Switch
Proven solution for broadband and legacy voice Nearly 30 deployments
Division of Data Connection Leading independent provider of networking and
IP applications technology Privately-owned and self-funded - stable Consistently profitable since establishment in 1981
2002: Revenue $35M, Earnings $11M
275 employees in US and UK
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MIGRATION MODELS
Simplified legacy network
LoopConcentrator
Various/ TDM
LegacyClass 5/LE
Switch
SS7/ TDMPOTS
PSTN
Class 4Tandem
Switch
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MIGRATION MODELS
Technical view of migration: Core-out replaces tandem layer using SIP or just SS7/IP
LoopConcentrator
Various/ TDM
LegacyClass 5/LE
Switch
SS7/ TDMPOTS
NGNTandem
SIP or SS7/IP
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MIGRATION MODELS
Technical view of migration: Core-out replaces tandem layer using SIP or just SS7/IP Edge-in focus on local exchanges and access network
Gateway solution possible
VoBGateway
MGCP/H.248
LegacyClass 5/LE
Switch
SS7Or SIP
MGCP/H.248or BLES
IAD
Class 4Tandem
Switch
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MIGRATION MODELS
Technical view of migration: Core-out replaces tandem layer Edge-in focus on local exchanges and access network
Gateway solution possible or full NGN
BLC or DSLAM
MGCP/H.248
SS7Or SIP
MGCP/H.248or SIP
IAD or IP Phone
Class 4/NGNTandem
Switch
VP3500
NGN Class 5Switch
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MIGRATION MODELS
Technical view of migration: Core-out replaces tandem layer Edge-in focus on local exchanges and access network
Gateway solution possible, or full NGN IP Phone/IADs or POTS via Broadband Loop Carriers
BLC or DSLAM
MGCP/H.248
SS7or SIP
MGCP/H.248or SIP
IAD
Class 4Tandem
Switch
VP3500
NGN Class 5Switch
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MIGRATION MODELS (1)
Technical View Omitted distributed CA/MG/TG/SG options for clarity
Business view Driven by network convergence savings
Both capex and opex reduced using single voice/data network
Biggest savings in the access network Carriers spend ~10x more on access equipment than on core
Some carriers hitting urgent switch capacity issues In all cases, equipment and supplier must be reliable
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SO WHAT WORKS?
Core VoIP migration already happening Even just SS7/IP using gateways can be a benefit Only addresses small portion of installed PSTN network
Much bigger savings via NGN access network Needs Class 5 softswitch with full regulatory features e.g.
Lawful Intercept for VoIP Totally IP-based solution right to customer premises Also solves issues with aging TDM concentrators Must have flexibility to deliver any service over any access
network type including POTS phone!
Minor Variations Leverage existing ATM network (if have one!) Can test the water using new services (e.g. flat-rate VoDSL)
or in new geographic areas
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CASE STUDY: FLEXIBLE DEPLOYMENT!
Next-GenerationClass 5 Switch
PSTN
eMTACMTS
DLC
ATM Switch
DSLAM
IAD
IAD
POTS
IP / Cable
T1
DSL
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ENGINEERING CHALLENGES
Firewalls & NAT Installed CPE routers mostly dont support NAT for RTP in
SIP or MGCP headers Border Session Controllers can cure this Particular issue for wholesale carriers as their ISP
customers can have overlapping addresses
Reliability limits Carrier class softswitches are, of course, reliable In theory, can build a softswitch supporting millions of lines
or even a whole network but wheres the survivability? Suggest limit single Call Agent domain to
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PHILOSOPHICAL MUSINGS
Will softswitches replace the PSTN? Yes but it will take 10-15 years.
Will the NGN be a flat network? No. Reduced hierarchy, but still need routing between
softswitch domains.
Will the future be totally mobile? No. Wireline quality will still be important in many markets
Can all service intelligence migrate to edge devices?
No. Try implementing a large Multiple AppearanceDirectory Number service with peer SIP phones!
Will VoIP avoid lawful intercept requirements? Sadly, not for long!
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