Re: [MMUSIC] WGLC for draft-ietf-mmusic-data-channel-sdpneg

Christian Groves <Christian.Groves@nteczone.com> Sun, 07 February 2016 23:13 UTC

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From: Christian Groves <Christian.Groves@nteczone.com>
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Date: Mon, 8 Feb 2016 10:13:29 +1100
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Subject: Re: [MMUSIC] WGLC for draft-ietf-mmusic-data-channel-sdpneg
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Hello Paul,

On 7/02/2016 5:44 AM, Paul Kyzivat wrote:
> On 2/4/16 10:43 PM, Christian Groves wrote:
>> Isn't this the approach we're taking today?
>> draft-ietf-mmusic-data-channel-sdpneg has general text and specific
>> drafts are used to describe protocols that use the mechanism (i.e.
>> draft-ietf-mmusic-msrp-usage-data-channel & 
>> draft-ietf-clue-datachannel).
>
> It remains to be seen if that will be enough. E.g., there currently 
> aren't any iana considerations in 
> draft-ietf-mmusic-msrp-usage-data-channel.
>
> Suppose I encounter some sdp that uses msrp over a data channel, but 
> that usage is unknown to me. How do I find the spec (the reference to 
> draft-ietf-mmusic-msrp-usage-data-channel) that defines that usage?
[CNG] If you're using data channel then you'd register a websocket 
subprotocol ID (e.g. as we do for CLUE). This should then point to the 
specification that defines the use of the sub-protocol within the 
datachannel. The dcsa parameters can't live without the a=dcmap line 
with the subprotocol.

I agree we need to document something in the IANA considerations section.

Regards, Christian