Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

RTP Payload for Text Conversation (RFC4103)

IP.com Disclosure Number: IPCOM000125505D
Original Publication Date: 2005-Jun-01
Included in the Prior Art Database: 2005-Jun-04
Document File: 21 page(s) / 44K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Hellstrom: AUTHOR [+2]

Abstract

This memo obsoletes RFC 2793; it describes how to carry real-time text conversation session contents in RTP packets. Text conversation session contents are specified in ITU-T Recommendation T.140.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 6% of the total text.

Network Working Group                                      G. Hellstrom
Request for Comments: 4103                                   Omnitor AB
Obsoletes: 2793                                                P. Jones
Category: Standards Track                           Cisco Systems, Inc.
                                                              June 2005


                   RTP Payload for Text Conversation

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   This memo obsoletes RFC 2793; it describes how to carry real-time
   text conversation session contents in RTP packets.  Text conversation
   session contents are specified in ITU-T Recommendation T.140.

   One payload format is described for transmitting text on a separate
   RTP session dedicated for the transmission of text.

   This RTP payload description recommends a method to include redundant
   text from already transmitted packets in order to reduce the risk of
   text loss caused by packet loss.


Hellstrom & Jones           Standards Track                     [Page 1]
RFC 4103           RTP Payload for Text Conversation           June 2005


Table of Contents

   1.  Introduction ...................................................3
   2.  Conventions Used in This Document ..............................4
   3.  Usage of RTP ...................................................4
       3.1. Motivations and Rationale .................................4
       3.2. Payload Format for Transmission of text/t140 Data .........4
       3.3. The "T140block" ...........................................5
       3.4. Synchronization of Text with Other Media ..................5
       3.5. RTP Packet Header .........................................5
   4.  Protection against Loss of Data ................................6
       4.1. Payload Format When Using Redundancy ......................6
       4.2. Using Redundancy with the text/t140 Format ................7
   5.  Recommended Procedure ..........................................8
       5.1. Recommended Basic Procedure ...............................8
       5.2. Transmission before and after "Idle Periods" ..............8
       5.3. Detection of Lost Text Packets ...................