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Re: [MMUSIC] IETF#89: BUNDLE: Q9: What are the criteria for allowing usage of the same PT value within multiple m- lines?

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 03 March 2014 11:17 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Suhas Nandakumar <suhasietf@gmail.com>, Colin Perkins <csp@csperkins.org>
Thread-Topic: [MMUSIC] IETF#89: BUNDLE: Q9: What are the criteria for allowing usage of the same PT value within multiple m- lines?
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Date: Mon, 03 Mar 2014 11:17:38 +0000
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Subject: Re: [MMUSIC] IETF#89: BUNDLE: Q9: What are the criteria for allowing usage of the same PT value within multiple m- lines?
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Hi,

We've discussed this multiple times before. If payload types numbers are unique across m= lines, then obviously you can use them to identify the m= line. If you reuse payload type values across m= lines, then you need some other way of identifying m= lines, if you care about doing so. Signalled SSRC values are one approach, something like AppID might be another.


I agree with Colin. There needs to be a way to correlate incoming rtp streams in this scenario and early media scenario

I agree. The question is: when you send the first offer, and assign the PT values you want to receive, how do you know whether the remote peer supports "a way"?

Regards,

Christer

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