international telecommunication union plenary session on itu-t standards 15th biennial tdi...
TRANSCRIPT
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International Telecommunication Union
Plenary Session on ITU-T Standards15th Biennial TDI International Conference –
Las Vegas, Nevada, USA
Total Conversation through ITU-T Total Conversation through ITU-T Standards:Standards:
Sign, Type, and Speak – You DecideSign, Type, and Speak – You Decide
Paul E. JonesCisco Systems, Inc.
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In the beginning, communication devices for the deaf opened a whole new world for the users of those devices.
But times change…
Friends and family were able to carry on conversations over long distances, helping to maintain and even strengthen those relationships.
They enabled people to communicate in ways that were never possible before.
Without question, the introduction of the telecommunication devices for the deaf enriched everyone's lives.
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314-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
And so do the modes of communication!
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414-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
It’s All AboutTotal Conversation
o The ITU-T is working on standards that bring about the convergence of• Voice telephony• Video telephony• Text telephony
o These standards aim to enable what it calls “Total Conversation”
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514-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
Defining the Multimedia Service
o The ITU-T defined a series of service specifications and included text and video as components of the multimedia services (F.700 and F.703)
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614-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
Popular Multimedia Systems
o H.323 – Multimedia communication over packet-switched networks (Internet)
o SIP – Session Initiation Protocol (Internet) (IETF)
o H.320 - Multimedia communication over ISDN
o H.324 – Multimedia communication over low bit-rate links (phone lines and mobile phones)
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714-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
Problems with These Systems Identified
o Multimedia systems had largely focused only on voice and video
o There was a lack of support for text (or at least acceptable text)
o Video support often did not take into consideration the needs of the deaf
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814-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
More Standards
o H Series Supplement 1 – Raised awareness about sign language and lip reading as it relates to video quality
o T.140 – Standard to allow Unicode for textual conversation• IETF RFC 2793 defines the transport
of T.140 over IP networks• Used by both H.323 and SIP systems
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914-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
Integration
o During the 1997 – 2000 timeframe, the ITU-T worked to add support for real-time text communication to the popular multimedia systems
o Acceptable video support was more of an educational exercise… and the ITU-T has made an effort to educate!
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1014-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
…But Still Segregated
o The video conferencing systems in use today are:• Largely used between two parties
who have the same equipment• Not “tied into” the larger public
communications networkso Further integration is required
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1114-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
The VoIP Revolution
o Since the late 1990s, the communications industry has been heavily focused on “voice over IP” or “VoIP”
o The basic idea is to simply use the Internet Protocol (IP) to carry voice, video, and data communications (sounds simple enough, huh?)
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1214-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
The VoIP Revolution (cont)
o VoIP is still in its infancy, as compared to the mature public switched telephone network (PSTN)
o Even so, a large number of telephone calls are carried over IP networks today
o Unfortunately, multimedia communication services (the video and textual components) have been slower to “take off”
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1314-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
Bridging Two PSTN Networks over an IP Network
Service Provider IP Core Network
H.323 PSTN Gateways
GK GK GK
“Directory” Gatekeepers
GKGK
H.248 PSTN Gateways
MGCMGC
GKGK
“Text over IP” – V.toipScheduled for approval in January 2004
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1414-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
ToIP Objectives
o Allow for character-by-character text communication
o Allow for simultaneous two-way conversation, along with voice and video (inherent limitations of the PSTN an obstacle)
o Standardize on an international character set (Unicode)
o Support all standard TTY device types defined in ITU-T V.18
o Enable different device types to communicate through each other by using the gateways as “interworking” devices (see next slide)
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1514-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
Interworking TTY Types through the use of T.140
Baudot DeviceV.21 Device
IP Network
T.140 bridges the gap
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1614-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
Building Bridges to the Enterprise and Residence
Service Provider IP Core Network
GK
Residence
Enterprise
GK
H.323 PSTN Gateways
GK GK GK
“Directory” Gatekeepers
GKGK
H.248 PSTN Gateways
MGCMGC
Audio and Video Terminals and TTYs
GKGK
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1714-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
Ultimate Goals
o To allow any device to support the transmission of video and/or text signals
o To allow a user on a PC connected to an IP network to chat with a user on a legacy PSTN TTY device
o To improve communications with the widespread adoption of video
o To allow a user with a wireless PDA to communicate with anybody in the world
o To not require special tools for communications
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1814-16 July 2003 15th Biennial TDI International Conference – Las Vegas, Nevada, USA
ITU-T
ITU-T Standards…
Enable Video, Text, and Voice Communications.
So you can Sign, Type, or Speak.
You Decide!