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Re: [MMUSIC] [rtcweb] Updating JSEP and BUNDLE

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 27 January 2021 23:26 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Roman Shpount <roman@telurix.com>
CC: Justin Uberti <juberti@google.com>, "Murray S. Kucherawy" <superuser@gmail.com>, Magnus Westerlund <magnus.westerlund=40ericsson.com@dmarc.ietf.org>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: [MMUSIC] [rtcweb] Updating JSEP and BUNDLE
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Date: Wed, 27 Jan 2021 23:26:03 +0000
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Subject: Re: [MMUSIC] [rtcweb] Updating JSEP and BUNDLE
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Hi,

>Can you or anyone else provide the reference to the document which prohibits using the same port in multiple m= lines?

It is not prohibited, but the SDP spec says that the semantics is undefined.

Now, in BUNDLE we can define semantics for usage of multiple m= lines, and BUNDLE endpoints would support that semantics.

The problem is if you send an initial INVITE that reaches a non-BUNDLE endpoint. There is no way to know how that endpoint will process the offer, and we have seen that the offer gets rejected (in different ways).

Regards,

Christer

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