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Re: [MMUSIC] 1-week WGLC on Section 7.6 (3PCC Considerations) in draft-ietf-mmusic-rfc8843bis-06

Paul Kyzivat <pkyzivat@alum.mit.edu> Sat, 20 November 2021 16:37 UTC

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From: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/sRZYzlbcNu3hddXBuigTsgiUxec>
Subject: Re: [MMUSIC] 1-week WGLC on Section 7.6 (3PCC Considerations) in draft-ietf-mmusic-rfc8843bis-06
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Hi,

This is interesting ...

On 11/17/21 6:16 PM, Flemming Andreasen wrote:
> Greetings MMUSIC
> 
> We previously submitted draft-ietf-mmusic-rfc8843bis for publication, 
> however subsequently, the issue of 3rd Party Call Control came up and as 
> a result of that, Section 7.6 has been updated accordingly.
> 
> We are hereby starting a 1-week WGLC on Section 7.6 only in 
> draft-ietf-mmusic-rfc8843bis-06.
> 
> If you have any comments on Section 7.6, please send those to the 
> document authors and the MMUSIC mailing list by Wednesday November 24, 
> 2021. If you review it but do not have any comments, please send a note 
> to that effect as well.

This approach has a limitation:

If the new UA is unable/unwilling to bundle the media then the updated 
call will be limited to a single media stream, even if the old UA is 
willing to operate with unbundled media.

An alternative way to do this is for the 3pcc controller start the 
transfer by sending the old UA an offerless INVITE/Replaces. That will 
result in getting an initial bundle offer that should give maximum 
flexibility to the new UA.

Its possible that the old UA doesn't support INVITE/Replaces. If so, the 
3pcc controller could then fall back to the method currently in 7.6.

	Thanks,
	Paul

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