RTP-Mixer Formatting of Multiparty Real-Time Text

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Publisher: IETF
Doc Type: Standard
Pages: 35
Abstract: This document provides enhancements of real-time text (as specified in RFC 4103) suitable for mixing in a centralized conference model, enabling source identification and rapidly interleaved transmission of text from different sources. The intended use is for real-time text mixers and participant endpoints capable of providing an efficient presentation or other treatment of a multiparty real-time text session. The specified mechanism builds on the standard use of the Contributing Source (CSRC) list in the Real-time Transport Protocol (RTP) packet for source identification. The method makes use of the same "text/t140" and "text/red" formats as for two-party sessions. Solutions using multiple RTP streams in the same RTP session are briefly mentioned, as they could have some benefits over the RTP-mixer model. The RTP-mixer model was selected to be used for the fully specified solution in this document because it can be applied to a wide range of existing RTP implementations. A capability exchange is specified so that it can be verified that a mixer and a participant can handle the multiparty-coded real-time text stream using the RTP-mixer method. The capability is indicated by the use of a Session Description Protocol (SDP) (RFC 8866) media attribute, "rtt-mixer". This document updates RFC 4103 ("RTP Payload for Text Conversation"). A specification for how a mixer can format text for the case when the endpoint is not multiparty aware is also provided.
Publication Date: 2021-07-01
Status Note: Proposed Standard
DOI: 10.17487/RFC9071
Link: https://doi.org/10.17487/RFC9071
Author(s): Gunnar Hellstrom
Keyword(s): Conference, Bridging, SIP

Latest version of IETF RFC 9071

Document Versions — IETF RFC 9071

▶ IETF RFC 9071 (2021-07-01)

THIS DOC [ACTIVE] [LATEST VERSION]

Normative Reference(s)

ECMA.48.199106 — ECMA-48 EXTERNAL
ISO.6429.1992 — ISO-6429 EXTERNAL
IETF RFC 2119 [Active*]
IETF RFC 3550 [Active*]
IETF RFC 4102 [Active*]
IETF RFC 4103 [Active*]
IETF RFC 5630 [Active*]
IETF RFC 5764 [Active*]
RFC6263 — RFC6263 EXTERNAL
RFC7675 — RFC7675 EXTERNAL
IETF RFC 8174 [Active*]
RFC8865 — RFC8865 EXTERNAL
IETF RFC 8866 [Active*]
T-REC-T.140.1998 — 1 EXTERNAL
T-REC-T.140.2000 — T140ad1 EXTERNAL

Bibliographic Reference(s)

IETF RFC 4353 [Active*]
RFC4575 — 9 EXTERNAL
IETF RFC 4579 [Active*]
RFC5194 — RFC5194 EXTERNAL
RFC7667 — RFC7667 EXTERNAL
RFC8643 — RFC8643 EXTERNAL
RFC8723 — RFC8723 EXTERNAL
RFC8825 — RFC8825 EXTERNAL

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IETF RFC 9071, RTP-Mixer Formatting of Multiparty Real-Time Text
doi: 10.17487/RFC9071
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<cite id="bib-rfc9071">IETF RFC 9071</cite>, RTP-Mixer Formatting of Multiparty Real-Time Text
<span class="doi">10.17487/RFC9071</span>
</li>