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Re: [MMUSIC] WGLC on draft-ietf-mmusic-rfc8843bis-00

Christer Holmberg <christer.holmberg@ericsson.com> Tue, 22 June 2021 20:39 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Roman Shpount <roman@telurix.com>
CC: Paul Kyzivat <pkyzivat@alum.mit.edu>, mmusic WG <mmusic@ietf.org>
Thread-Topic: [MMUSIC] WGLC on draft-ietf-mmusic-rfc8843bis-00
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/dPbMBJ1O6aP4esR1sDTHP19xrkY>
Subject: Re: [MMUSIC] WGLC on draft-ietf-mmusic-rfc8843bis-00
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Hi,

>I think this change is in scope since the problem with 3PCC was introduced by the changes you just made. Before the JSEP alignment fix, subsequent offers would have port 0 in the
>m= line and a=bundle-only on all the bundled m= lines. This would make it a valid initial offer for 3PCC. With the new changes,  bundled m= lines will have the address and port reused, which is not a valid initial offer.

Fair enough.

>I am generally ok with the text but based on the confusion that the term "Initial SDP Offer" caused Paul, I would suggest omitting it and changing the text to:
>
>7.6. SIP Considerations
>
>The Session Initiation Protocol (SIP) [RFC3261] allows a User Agent Client (UAC) to send a re-INVITE request without an SDP body (sometimes referred to as an empty re-INVITE). In such cases, the
>User Agent Server (UAS) will include an SDP Offer in the associated 200 OK response. This is typically used for 3rd Party Call Control (3PCC) scenarios. From a BUNDLE perspective, such SDP Offer SHOULD
>be generated using procedures defined in [Section7.2].

I’d be fine with that.

Regards,

Christer



On Tue, Jun 22, 2021 at 1:12 PM Christer Holmberg <christer.holmberg@ericsson.com<mailto:christer.holmberg@ericsson.com>> wrote:
Hi,

I think it is important to keep in mind that the scope of 8843bis was only to fix the BUNDLE/JSEP alignment, and to implement some of the erratas.

Having said that, unless someone objects I am fine adding something like:

---

7.6. SIP Considerations

The Session Initiation Protocol (SIP) [RFC3261] allows a User Agent Client (UAC) to send a re-INVITE request without
an SDP body (sometimes referred to as an empty re-INVITE). In such cases the User Agent Server (UAS) will include an
SDP Offer in the associated 200 OK response. This is typically used for 3rd Party Call Control (3PCC)
scenarios. From a BUNDLE perspective, such SDP Offer SHOULD be generated as an Initial SDP Offer [Section7.2].

---

Regards,

Christer

-----Original Message-----
From: mmusic <mmusic-bounces@ietf.org<mailto:mmusic-bounces@ietf.org>> On Behalf Of Paul Kyzivat
Sent: perjantai 18. kesäkuuta 2021 20.49
To: Roman Shpount <roman@telurix.com<mailto:roman@telurix.com>>
Cc: mmusic WG <mmusic@ietf.org<mailto:mmusic@ietf.org>>
Subject: Re: [MMUSIC] WGLC on draft-ietf-mmusic-rfc8843bis-00

On 6/18/21 1:14 PM, Roman Shpount wrote:
> Let me be more specific -- I meant rules defined for initial SDP offer
> in
> https://www.ietf.org/archive/id/draft-ietf-mmusic-rfc8843bis-02.html#s
> ection-7.2
> <https://www.ietf.org/archive/id/draft-ietf-mmusic-rfc8843bis-02.html#<https://www.ietf.org/archive/id/draft-ietf-mmusic-rfc8843bis-02.html>
> section-7.2>, not all rules for initial SDP offers. Specifically, all
> m= lines should either have a different address:port for each bundled
> m= line and be prepared to receive media on these addresses or should
> have port 0 and a=bundle-only

Ahh. OK.

        Thanks,
        Paul

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