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Re: [MMUSIC] Mismatch between sdp-bundle-negotiation and RFC5888

Christer Holmberg <christer.holmberg@ericsson.com> Sun, 02 December 2018 18:22 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Roman Shpount <roman@telurix.com>
CC: mmusic WG <mmusic@ietf.org>
Thread-Topic: Mismatch between sdp-bundle-negotiation and RFC5888
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Date: Sun, 02 Dec 2018 18:22:32 +0000
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Subject: Re: [MMUSIC] Mismatch between sdp-bundle-negotiation and RFC5888
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Hi,

>>>>> I know this is a really late notice, but I think there is a slight mismatch between RFC5888 and sdp-bundle.
>>>>> 
>>>>> RFC 5888 Section 9.2 (https://tools.ietf.org/html/rfc5888#section-9.2) says: 
>>>>> 
>>>>>   SIP entities refuse media streams by setting the port to zero in the corresponding "m" line. "a=group" lines MUST NOT 
>>>>>   contain identification-tags that correspond to "m" lines with the port set to zero.
>>>>> 
>>>>> Considering that sdp-bundle redefines the meaning of port zero when 'bundle-only' attribute is present, RFC5888 will need 
>>>>> to be updated to allow including bundle-only media streams in the "a=group" lines.
>>>>
>>>>…or, one could argue that the text in RFC5888 only applies to the case when port zero is used to refuse a media stream. 
>>>
>>> One could argue this, but the language in RFC 5888 is quite blunt.
>>
>> So, you really want to bring BUNDLE back to the WG again?
>
> No, I really do not want to bring it back. Somebody implementing BUNDLE asked me, so I wanted to ask on the list. I would suggest we argue that 
> BUNDLE overwrites all uses of port 0 to disable the media stream, including the one in RFC5888. 

I don't think BUNDLE overwrites ALL uses of port 0 to disable the media stream.

In any case, my understanding was that you want to add something to BUNDLE?

Regards,

Christer

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