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

Christer Holmberg <christer.holmberg@ericsson.com> Sat, 20 November 2021 17:06 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: [MMUSIC] 1-week WGLC on Section 7.6 (3PCC Considerations) in draft-ietf-mmusic-rfc8843bis-06
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Date: Sat, 20 Nov 2021 17:06:35 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/adNmA14bQIdE1LXQ1D5o9czuZC4>
Subject: Re: [MMUSIC] 1-week WGLC on Section 7.6 (3PCC Considerations) in draft-ietf-mmusic-rfc8843bis-06
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Hi,

The purpose of the text is not to mandate 3PCC to be implemented in a specific way. The purpose is to point out that if 3PCC is implemented in a way that the 3PCC controller receives a subsequent BUNDLE offer from an endpoint currently in a session, it needs to convert it into an initial BUNDLE offer before forwarding it to an endpoint that is currently not in a session.

Regards,

Christer

-----Original Message-----
From: mmusic <mmusic-bounces@ietf.org> On Behalf Of Paul Kyzivat
Sent: lauantai 20. marraskuuta 2021 18.37
To: mmusic@ietf.org
Subject: Re: [MMUSIC] 1-week WGLC on Section 7.6 (3PCC Considerations) in draft-ietf-mmusic-rfc8843bis-06

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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