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Re: [MMUSIC] [rtcweb] Updating JSEP and BUNDLE: Semantics of same port in multiple m- lines

Justin Uberti <juberti@google.com> Sun, 31 January 2021 17:34 UTC

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From: Justin Uberti <juberti@google.com>
Date: Sun, 31 Jan 2021 09:34:00 -0800
Message-ID: <CAOJ7v-37BCCypHcpZPq-Sir4XNVGZeyY302jCg3nHEOWpbpT6Q@mail.gmail.com>
To: Roman Shpount <roman@telurix.com>
Cc: Christer Holmberg <christer.holmberg=40ericsson.com@dmarc.ietf.org>, Magnus Westerlund <magnus.westerlund@ericsson.com>, "mmusic@ietf.org" <mmusic@ietf.org>
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Subject: Re: [MMUSIC] [rtcweb] Updating JSEP and BUNDLE: Semantics of same port in multiple m- lines
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On Sat, Jan 30, 2021 at 9:20 PM Roman Shpount <roman@telurix.com> wrote:

>
> On Sat, Jan 30, 2021 at 5:31 PM Justin Uberti <juberti@google.com> wrote:
>
>> bundle-only outside a bundle group is unspecified.
>>>
>>>    "The usage of the 'bundle-only' attribute is only defined for a
>>>    bundled "m=" section with a zero port value.  Other usage is
>>>    unspecified."
>>>
>>> (Section 6 of BUNDLE)
>>>
>>
>> Thank you for finding that section. If bundle-unaware entities do in fact
>> copy attributes to the offer, I think it would be useful to amend this text
>> to say that a=bundle-only must be ignored for any sections that are not in
>> a bundle group, so that these sections can be properly rejected.
>>
>
> Copying the entire m= line from an offer and setting the port to zero was
> traditionally a "safe" way to refuse the m= line section which the endpoint
> does not understand.
>
> If you want, I can check how various carriers/SBC/phones respond to an
> offer with bundle-only m= line and port zero.
>

No need to go too deep here, but getting a basic understanding of how these
devices react would be useful.

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