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Total Conversation through ITU-T Standards: Sign, Type, and Speak – You Decide. Paul E. Jones Cisco Systems, Inc. In the beginning, communication devices for the deaf opened a whole new world for the users of those devices. .

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Total conversation through itu t standards sign type and speak you decide l.jpg

Total Conversation through ITU-T Standards:Sign, Type, and Speak – You Decide

Paul E. Jones

Cisco 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.

They enabled people to communicate in ways that were never possible before.

Friends and family were able to carry on conversations over long distances, helping to maintain and even strengthen those relationships.

Without question, the introduction of the telecommunication devices for the deaf enriched everyone's lives.

But times change…


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And so do the modes of communication! a whole new world for the users of those devices.

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


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It’s All About a whole new world for the users of those devices. Total Conversation

  • The ITU-T is working on standards that bring about the convergence of

    • Voice telephony

    • Video telephony

    • Text telephony

  • These standards aim to enable what it calls “Total Conversation”

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


Defining the multimedia service l.jpg
Defining the Multimedia Service a whole new world for the users of those devices.

  • 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)

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


Popular multimedia systems l.jpg
Popular Multimedia Systems a whole new world for the users of those devices.

  • H.323 – Multimedia communication over packet-switched networks (Internet)

  • SIP – Session Initiation Protocol (Internet) (IETF)

  • H.320 - Multimedia communication over ISDN

  • H.324 – Multimedia communication over low bit-rate links (phone lines and mobile phones)

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


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Problems with These Systems Identified a whole new world for the users of those devices.

  • Multimedia systems had largely focused only on voice and video

  • There was a lack of support for text (or at least acceptable text)

  • Video support often did not take into consideration the needs of the deaf

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


More standards l.jpg
More Standards a whole new world for the users of those devices.

  • H Series Supplement 1 – Raised awareness about sign language and lip reading as it relates to video quality

  • 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

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


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Integration a whole new world for the users of those devices.

  • During the 1997 – 2000 timeframe, the ITU-T worked to add support for real-time text communication to the popular multimedia systems

  • Acceptable video support was more of an educational exercise… and the ITU-T has made an effort to educate!

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


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…But Still Segregated a whole new world for the users of those devices.

  • 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 networks

  • Further integration is required

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


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The VoIP Revolution a whole new world for the users of those devices.

  • Since the late 1990s, the communications industry has been heavily focused on “voice over IP” or “VoIP”

  • The basic idea is to simply use the Internet Protocol (IP) to carry voice, video, and data communications (sounds simple enough, huh?)

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


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The VoIP Revolution (cont) a whole new world for the users of those devices.

  • VoIP is still in its infancy, as compared to the mature public switched telephone network (PSTN)

  • Even so, a large number of telephone calls are carried over IP networks today

  • Unfortunately, multimedia communication services (the video and textual components) have been slower to “take off”

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


Bridging two pstn networks over an ip network l.jpg

GK a whole new world for the users of those devices.

GK

GK

GK

GK

MGC

MGC

GK

GK

Bridging Two PSTN Networks over an IP Network

“Directory” Gatekeepers

Service Provider IP Core Network

H.323 PSTN Gateways

H.248 PSTN Gateways

“Text over IP” – V.toip

Scheduled for approval in January 2004

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


Toip objectives l.jpg
ToIP Objectives a whole new world for the users of those devices.

  • Allow for character-by-character text communication

  • Allow for simultaneous two-way conversation, along with voice and video (inherent limitations of the PSTN an obstacle)

  • Standardize on an international character set (Unicode)

  • Support all standard TTY device types defined in ITU-T V.18

  • Enable different device types to communicate through each other by using the gateways as “interworking” devices (see next slide)

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


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Interworking TTY Types through the use of T.140 a whole new world for the users of those devices.

IP Network

Baudot Device

V.21 Device

T.140 bridges the gap

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


Building bridges to the enterprise and residence l.jpg

GK a whole new world for the users of those devices.

GK

GK

GK

GK

GK

GK

GK

MGC

MGC

GK

Building Bridges to the Enterprise and Residence

H.248 PSTN Gateways

“Directory” Gatekeepers

Residence

Service Provider IP Core Network

Enterprise

H.323 PSTN Gateways

Audio and Video Terminals and TTYs

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


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Ultimate Goals a whole new world for the users of those devices.

  • To allow any device to support the transmission of video and/or text signals

  • To allow a user on a PC connected to an IP network to chat with a user on a legacy PSTN TTY device

  • To improve communications with the widespread adoption of video

  • To allow a user with a wireless PDA to communicate with anybody in the world

  • To not require special tools for communications

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


Itu t standards l.jpg
ITU-T Standards… a whole new world for the users of those devices.

Enable Video, Text, and Voice Communications.

So you can Sign, Type, or Speak.

You Decide!

15th Biennial TDI International Conference – Las Vegas, Nevada, USA


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