[AVTCORE] I-D Action: draft-ietf-avtcore-multi-party-rtt-mix-07.txt

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Subject: [AVTCORE] I-D Action: draft-ietf-avtcore-multi-party-rtt-mix-07.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Audio/Video Transport Core Maintenance WG of the IETF.

        Title           : RTP-mixer formatting of multi-party Real-time text
        Author          : Gunnar Hellstrom
	Filename        : draft-ietf-avtcore-multi-party-rtt-mix-07.txt
	Pages           : 53
	Date            : 2020-07-12

   Real-time text mixers for multi-party sessions need to identify the
   source of each transmitted group of text so that the text can be
   presented by endpoints in suitable grouping with other text from the
   same source.

   Regional regulatory requirements specify provision of real-time text
   in multi-party calls.  RFC 4103 mixer implementations can use
   traditional RTP functions for source identification, but the mixer
   source switching performance is limited when using the default
   transmission with redundancy.

   Enhancements for RFC 4103 real-time text mixing is provided in this
   document, suitable for a centralized conference model that enables
   source identification and source switching.  The intended use is for
   real-time text mixers and multi-party-aware participant endpoints.
   Two mechanisms are provided.  The mechanisms builds on use of the
   CSRC list in the RTP packet for source identification.  One method
   makes use of the same "text/red" format as for two-party sessions,
   while the other makes use of an extended packet format "text/rex" for
   more efficient transmission.

   A capability exchange is specified so that it can be verified that a
   participant can handle the multi-party coded real-time text stream.
   The capability for one method is by use of a media attribute a=rtt-
   mix-rtp-mixer.  The other method is indicated by the media subtype

   The document updates RFC 4102[RFC4102] and RFC 4103[RFC4103]

   A brief description about how a mixer can format text for the case
   when the endpoint is not multi-party aware is also provided.

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