Re: [MMUSIC] DECISION: Usage of same PT value in multiple m- lines for SAME codec configuration

[Christer Holmberg <[e-mail]>]

Hi,

> Jonathan Lennox, Qin and I submitted a draft about mapping the PT from the SDP m-line to the application semantics.
> It allows for having the same PT numbers in different m-lines since each m-line will have different application IDs that can be used to map to an SSRC using RTCP SDES or RTP header extension.

And, the same PT numbers could, in different m- lines, even be used for different codecs/codec configurations?

Regards,

Christer


From: [e-mail]<mailto:[e-mail]> [mailto:[e-mail]] On Behalf Of Christer Holmberg
Sent: 28 June, 2013 2:25 PM
To: [e-mail]<mailto:[e-mail]>
Subject: [MMUSIC] DECISION: Usage of same PT value in multiple m- lines for SAME codec configuration

Hi,

In Q1, I asked whether we can agree that a PT value can only be used for a single codec configuration. Eventhough the question is still open, the feedback received so far seem to indicate that people agree to that.

We have also discussed whether it should, within a BUNDLE group, be allowed to use the same PT value in multiple m- lines - if used for the same codec configuration. I will now put forward a question on that :)


Q7: Within a BUNDLE group, do we allow the usage of the same PT value in multiple RTP m- lines, for the SAME codec configuration?

Note: This of course prevents the mapping to m- line purely based on PT, and based on the outcome of that discussion we may have to add restrictions on when the same PT value can be used etc. But, this question is whether we generally want to allow the usage of the same PT value in multiple m- lines :)

Regards,

Christer