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Re: [MMUSIC] Draft new version: draft-ietf-mmusic-dtls-sdp-09

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 02 March 2016 21:51 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, Roman Shpount <roman@telurix.com>
Thread-Topic: [MMUSIC] Draft new version: draft-ietf-mmusic-dtls-sdp-09
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Date: Wed, 02 Mar 2016 21:50:35 +0000
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Subject: Re: [MMUSIC] Draft new version: draft-ietf-mmusic-dtls-sdp-09
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Hi,

>>>> So, do we still need some changes in draft-dtls-sdp?
>>>>
>>>> Perhaps we should completely remove section 3.4 (“Multiple SDP 
>>>> fingerprint attributes”), and cover it in the 4572 update?
>>>
>>> Every place in the document that mentions "fingerprint" needs to be 
>>> adjusted so it *allows* multiple fingerprints and makes sense if 
>>> there are more than one. (You got some but not all of them.)
>>
>> That change I have done, and it will be in the next version of the document.
>>
>>> Hopefully anything that deals with the semantics of having multiple fingerprints can be delegated to 4572bis. That includes what it means if a fingerprint is added, removed, changed.
>>
>> So, you're ok with removing section 3.4 from draft-dtls-sdp?
>
> Well, as long as "fingerprint value change" is used elsewhere in the document it needs to be 
> defined *somewhere*. What 3.4 currently says is part of what bothers me, because it only 
> makes sense if you make certain assumptions about the semantics of multiple fingerprints.
>
> If it is defined in draft-4572-update then that can be referenced.

If we do it in draft-4572-update, then we only need to talk about "if the fingerprint changes" and  "inserting one or more fingerprint attributes" in draft-dtls-sdp, without going into the semantics.

I did a pre-10 version of the draft, and pushed it to Github:

https://github.com/cdh4u/draft-dtls-sdp

Regards,

Christer

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