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Re: [MMUSIC] Data channel dcsa attribute usage and IANA

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 28 August 2019 14:45 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] Data channel dcsa attribute usage and IANA
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Date: Wed, 28 Aug 2019 14:45:09 +0000
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Subject: Re: [MMUSIC] Data channel dcsa attribute usage and IANA
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Hi,

>> Section 7.2 of draft-ietf-mmusic-msrp-usage-data-channel updates the 
>> IANA registry for the SDP ‘setup’ attribute, by indicating that it can 
>> be used inside an SDP ‘dcsa’ attribute.
>> 
>> Do we really need to update the IANA registry for all SDP attributes 
>> that can be included in an ‘dcsa’ attribute???
>
> I think so. Look at RFC4566bis for the revised attribute registry.
>
> The way to avoid this would be to remove "Usage Level" from the registry and thus force 
> people to consult the defining documents for the attribute in order to learn this. But it is 
> seriously late in the cycle to update 4566bis.

I think it can be seen in two different ways, that have no impact on 4566bis.

1) If the usage level is "media", that doesn't change inside a dcsa attribute. From an SDP perspective it is still "media", as it is part of an m= line. If you place a "session" level attribute inside a dcsa attribute that changes, but I don't think we do that; or

2) From an SDP perspective, only the dcsa attribute is used. What's inside is "application specific", and has nothing to do with SDP.

Regards,

Christer




	Thanks,
	Paul

> There is no text in draft-mmusic-data-channel-neg about having to 
> modify the IANA registry for such attributes.
> 
> Regards,
> 
> Christer
> 
> 
> _______________________________________________
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