# Presentation: 707778

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

**Paul E. Jones****Cisco Systems, Inc.****May 7, 2004**

## It’s All About“Total Conversation”

**The ITU-T and IETF are 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”**

## Defining the Multimedia Service

**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)**
**Several multimedia protocols evolved, including: **
**H.323 – Multimedia communication over packet-switched networks (ITU-T)**
**SIP – Session Initiation Protocol (IETF)**
**H.320 - Multimedia communication over ISDN (ITU-T)**
**H.324 – Multimedia communication over low bit-rate links (phone lines and mobile phones) (ITU-T, 3GPP)**
**Multimedia systems largely focused only on voice and video**

## Standards focused on Disabilities

**H Series Supplement 1 – Raised awareness about sign language and lip reading as it relates to video quality**
**Standards to allow text conversation:**
**ITU-T T.140 defines a representation of text suitable for transmission over IP networks and able to support all languages in the world**
**IETF RFC 2793 defines how to transport T.140 over IP**
**H.323 and SIP can utilize RFC 2793 to transmit text**

## ToIP Objectives(“Text over IP”)

**Focused on bridging two PSTN networks via IP**
**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)**
**Enable legacy, PSTN devices to communicate with newer, IP-based systems**

**ToIP Site: http://www.packetizer.com/iptel/toip/**

## RFC-2793 Enables Global TTY Communications

- U.S. Baudot
- TTY Device

- United Kingdom
- V.21 TTY Device

**IP Network**

**Today, TTY devices are islands and cannot communicate with other text devices or other TTY protocol around the world**
**A new standard enables global TTY communications (e.g. V.21 to Baudot)**
**RFC-2793 enables transport of real-time text over VoIP**
**V.151 defines how to use RFC 2793 between PSTN gateways, allowing interconnection of dissimilar TTY types (expected ratification late 2004 / early 2005)**
**RFC-2793 enables text communication revolution**
**Integration with IP End Points (e.g. IP Phones, Voicemail, Softphone, etc.)**
**Integration with Instant Messaging (70M users)**
**Integration with wireless Short Messaging Systems (75M US users – IDC 2003, 1.3B world-wide users – Radicati)**

**PSTN**
**Gateway**

**PSTN**
**Gateway**

**PSTN – V.21**

**PSTN -Baudot**

**RFC-2793**

## Ultimate Goal – Total Conversation

**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**

## Conclusion

**Enable Video, Text, and Voice Communications.**
**So you can Sign, Type, or Speak.**
**You Decide.**