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

Paul Kyzivat <pkyzivat@alum.mit.edu> Mon, 01 February 2021 16:47 UTC

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From: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Date: Mon, 1 Feb 2021 11:47:28 -0500
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/JyGM62JeiJrz6TnBgS__uSQHmr0>
Subject: Re: [MMUSIC] [rtcweb] Updating JSEP and BUNDLE: Semantics of same port in multiple m- lines
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On 2/1/21 3:15 AM, Christer Holmberg wrote:

>>> 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???

	Thanks,
	Paul

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