FW: An important step for interoperability and functionality of text communication: RFC 4103 replaces RFC 2793.
simao.campos at itu.int
simao.campos at itu.int
Tue Jun 7 09:35:55 EDT 2005
FYI
-----Original Message-----
From: Gunnar Hellstrom [mailto:gunnar.hellstrom at omnitor.se]
Sent: 07 June 2005 11:13
To: Text Telephone Forum; STF267
Cc: Björn Troili; eConf Support; Frank Shearar; Andreas
Piirimets(Omnitor); Andreas Richter; Kristian Kristiansson; Johan
Malmgren; Bill Pechey; Judy Harkins; Paul Jones(Packetizer); Marcelo
Tapia; George Skorkowski; Bo Bergner; Robert Hecht; Andrea Saks; Guido
Gybels (E-mail); Arnoud van Wijk; Gregg Vanderheiden; TR-30. 1; Campos,
Simao; Tom Taylor; Henry Sinnreich; Christian Groves; Pekka. V. Heikkinen;
Claes Tjäder
Subject: An important step for interoperability and functionality of text
communication: RFC 4103 replaces RFC 2793.
An IETF document describing real time text transmission in IP networks is
approved and published.
The work with revision of the real time text transport specification RFC
2793 in IETF is completed.
During the work, we have called it rfc2793bis. The result is now published
as a standards track RFC:
RFC 4103 RTP Payload for Text Conversation
By that, RFC 2793 is made obsolete.
RFC 4103 is backwards compatible with its predecessor, so the move will be
smooth. There are two new parameters to handle.
All references to RFC 2793 in other standards can now be read as RFC 4103,
and should eventually be replaced in the texts by RFC 4103.
This is valid for example for the following documents referring to RFC
2793.
ITU-T H.323 Annex G Text converation and Text SET
ITU-T H.248.2 Text, Fax and call discrimination packages
ITU-T Draft requirements for text over IP
ITU-T Draft V.151 Procedures for the end-to-end
connection of analogue PSTN
text telephones over an IP network utilizing text relay.
ETSI TS 126 235 IP Multimedia default codecs
ETSI TS 123 226 Global Text Telephony Stage 2
ETSI Draft EG 202 320 Duplex Universal Speech and Text
3GPP TS 26.235 IP Multimedia default codecs
3GPP TS 23.226 Global Text Telephony Stage 2
draft-ietf-sipping-toip Text over IP requirements
draft-sinnreich-sipdev-req SIP telephony device requirements
draft-ietf-avt-rfc2833bis RTP Payload for DTMF Digits, Telephony
Tones and Telephony
Signals
draft-ietf-avt-rfc2833bisdata Definition of Events For Modem, FAX, and
Text Telephony Signals
The main improvements are:
--------------------------
-SDP examples clearly showing how a real time text channel can be
negotiated and opened in a SIP session.
-Clear packet layout examples showing various cases with and without
redundancy.
-Clearer and stronger recommendations to use the default two levels of
redundant transmission to keep the risk for character loss very low.
-Clearer and stronger recommendations to use 300 ms buffering between
transmissions in order to keep the risk for character loss very low and to
keep bandwidth usage for text very low.
-More explicit recommendations on how to apply security considerations.
-More explicit descriptions of the procedures for recovery from packet
loss.
-More explicit descriptions of the procedures for protection from
congestion.
By these improvements, I am sure that this RFC will contribute well to
good interoperability and high functionality of real time conversation
applications including the imnportant text medium as a popular feature
improving communications for all.
I and Paul Jones stand as authors, but many more have made this
improvement possible by putting efforts into the work.
Thanks to all!
Another related document has also been published. It is RFC 4102
Registration of the text/red MIME Sub-Type.
Here is a copy of the IETF announcements:
--------------------------------------------------------------------------
----------------
-
A new Request for Comments is now available in online RFC libraries.
RFC 4103
Title: RTP Payload for Text Conversation
Author(s): G. Hellstrom, P. Jones
Status: Standards Track
Date: June 2005
Mailbox: gunnar.hellstrom at omnitor.se, paulej at packetizer.com
Pages: 20
Characters: 44246
Obsoletes: 2793
I-D Tag: draft-ietf-avt-rfc2793bis-09.txt
URL: ftp://ftp.rfc-editor.org/in-notes/rfc4103.txt
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.
This document is a product of the Audio/Video Transport Working Group of
the IETF.
This is now a Proposed Standard Protocol.
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.
-------------------------------------------------------------------------
A new Request for Comments is now available in online RFC libraries.
RFC 4102
Title: Registration of the text/red MIME Sub-Type
Author(s): P. Jones
Status: Standards Track
Date: June 2005
Mailbox: paulej at packetizer.com
Pages: 6
Characters: 11337
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-avt-text-red-05.txt
URL: ftp://ftp.rfc-editor.org/in-notes/rfc4102.txt
This document defines the text/red MIME sub-type. "Red" is short for
redundant. The actual RTP packetization for this MIME type is specified
in RFC 2198.
This document is a product of the Audio/Video Transport Working Group of
the IETF.
This is now a Proposed Standard Protocol.
---------------------End of copy---------------------
Regards
Gunnar
-------------------------------------------
Gunnar Hellström
Omnitor AB
Renathvägen 2
SE 121 37 Johanneshov
SWEDEN
+46 8 556 002 03
Mob: +46 708 204 288
www.omnitor.se
Gunnar.Hellstrom at Omnitor.se
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