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

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 01 February 2021 17:27 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: [MMUSIC] [rtcweb] Updating JSEP and BUNDLE: Semantics of same port in multiple m- lines
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Date: Mon, 1 Feb 2021 17:27:16 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/5dwyO1jhx_kxhNd_lO85H7LL9BY>
Subject: Re: [MMUSIC] [rtcweb] Updating JSEP and BUNDLE: Semantics of same port in multiple m- lines
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Hi,

>>>> Sure, we could have done that. However, as has been discussed that in the past (in MMUSIC, SIPCORE etc), we typically don't describe situations that can occur when endpoints behave strangely, because it would easily become a slippery slope.
>>>> Also note that, in addition to bundle-only there can also be other attributes that have been copy/pasted by the remote endpoint.
>>>
>>> This is not "endpoints behaving strangely". This is the expected behavior of an endpoint that does not support bundle.
>> 
>> I don't think copy/pasting attributes you don't understand is expected behavior. That in general can cause lots of problems.
>> 
>> But, I do buy the argument that some endpoints do that, and that it is not (as far as I remember) explicitly forbidden.
>
> Shooting yourself in the head isn't AFAIK explicitly forbidden. But unless you understand and desire the consequences it is generally an unwise thing to do.
>
> I don't think an IETF document is obligated to protect against people doing either.
>
> Also, if we have an implementation that doesn't support bundle that is copying an a=bundle-only it doesn't understand, won't it also likely be copying a=group:bundle and a=mid???

My understanding was that it only affected media-level attributes.

But, sure, in theory an endpoint could copy ANYTHING it doesn't understand...

Regards,

Christer

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