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

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 29 February 2016 21:59 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Colin Perkins <csp@csperkins.org>
Thread-Topic: [MMUSIC] Offer/Answer PT Questions - text proposal
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Date: Mon, 29 Feb 2016 21:59:46 +0000
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Cc: "mmusic@ietf.org" <mmusic@ietf.org>, Paul Kyzivat <pkyzivat@alum.mit.edu>
Subject: Re: [MMUSIC] Offer/Answer PT Questions - text proposal
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Hi,

...

>> In any case, I think we have two separate questions:
>> 
>> 1. What are the rules within a given RTP session?
>
> A given RTP session has a mapping between RTP numbers and payload formats (i.e., codecs). All 
> participants in the session are supposed to agree on that mapping, otherwise bad things can happen (trying to decode a packet with the wrong codec).

So, that means that the mapping has to be unique in both directions. I.e. no usage of PT111/VP8 in one direction and PT111/AMR-WG in the other direction.

>> 2. Does a change of the RTP session, within the given SDP session, have an impact on the rules?
>
> The mapping is per RTP session. If two consecutive RTP sessions have the same mapping, that’s okay; it’s also okay if not. 

Thanks. So, again, is there a reason why we, within an SDP session, would allow recycle of the mapping - even if the associated RTP session changes?

Regards,

Christer

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