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

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 02 March 2016 22:24 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Colin Perkins <csp@csperkins.org>, Paul Kyzivat <pkyzivat@alum.mit.edu>
Thread-Topic: [MMUSIC] Offer/Answer PT Questions - text proposal
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Date: Wed, 02 Mar 2016 22:23:55 +0000
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Cc: "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] Offer/Answer PT Questions - text proposal
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Hi,

>> *If* it is really the case that there is no relationship between O/A and the lifetime of RTP sessions, then we have 
>> some work to do to sort out what the relationship is between what is in the O/A and what is in the RTP session.
>> 
>> IIUC, in the case where the is no RTP session prior an offer, the O/A must at least establish some initial PT bindings for the session-to-be.
>> 
>> (I have a feeling that what we are discussing is quite fundamental, and I find it shocking if it hasn't been considered in the past.)
>> 
>> Colin - your insight would be helpful here.
>
> I don’t have good insights here. I’ve long had the impression there are conflicts between the o/a rules and the RTP rules, but I’m insufficiently familiar with o/a to identify or resolve them.

What started this discussion was the uncertainty whether the same PT could be used for *different* codecs, per direction. The answer to that seem to be no: you can use different PTs for the same codec, but you cannot use the same PT for different codecs.

Also, I have also heard that a new RTP session does NOT require new PT bindings.

So, I may have missed something, but I fail to see any conflicts...

Regards,

Christer

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