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Re: [MMUSIC] Draft new version: t140-data-channel-usage-03

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 18 September 2019 11:22 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] Draft new version: t140-data-channel-usage-03
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Date: Wed, 18 Sep 2019 11:21:57 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/FiEu-uGFKTTjw1UWmUzraDpz44M>
Subject: Re: [MMUSIC] Draft new version: t140-data-channel-usage-03
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Hi,

...
    
* Section 4.2:
    
>> The subsections 4.2.n describe some specific SDP attributes that may be used with T.140 data channels. But it isn't definitive about 
>> other attributes. I think you should be explict whether other attributes maybe included. In any case, I think it would be prudent to 
>> specify that if other attributes are *received* and are not understood then they are to be ignored, in order to be consistent with 
>> SDP treatment of attributes.
>>    
> I think SDPNEG shall (unless it already does) define generic procedures for receiving non-supported SDP attributes in dcsa. 
> I assume it would be the same as for non-supported SDP attributes in general - ignore them.
   
Section 6.7 of SDPNEG says:

"SDP offer or answer has an "a=dcsa" attribute, whose subprotocol
      attribute is unknown.

      *  The receiver of such an SDP offer or answer SHOULD ignore this
         entire "a=dcsa" attribute line."

So, I think that covers your comment.

Regards,

Christer

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