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Re: [MMUSIC] Offer/Answer PT Questions - text proposal

Christer Holmberg <christer.holmberg@ericsson.com> Thu, 03 March 2016 09:52 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] Offer/Answer PT Questions - text proposal
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Date: Thu, 03 Mar 2016 09:51:55 +0000
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Subject: Re: [MMUSIC] Offer/Answer PT Questions - text proposal
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Hi,

...

>But suppose you are switched to another preexisting RTP session. It is new to you, but it isn't new, and has existing RTP bindings. And those might conflict with ones you had in your old RTP session.
>
>If you knew this was a new RTP session you could forget your old bindings, and start over.
>
>This sort of thing could happen if you are connecting to a conference server. First you are connected to an IVR to authenticate. That is your first RTP session. After that you are transferred into the conference. 
>That is your 2nd RTP session.
>
>If this is done via REFER, then you will see it as a new SIP and O/A session, and so will start out with an empty set of PT bindings.
>
>But if this is done via 3pcc, or a media relay, then we have the problem.

So, then, perhaps we should allow PT re-binding within an O/A session, in case the underlying RTP session etc changes?

Regards,

Christer

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