Re: [Rmt] SDP descriptors for ALC

Hi Imed and Rod,

I do have some comments on your proposal.

First of all why have both a=flute-tsi and an a=alc-tsi. Wouldn't a 
a=tsi attribute be more appropriate. To my understanding there is no 
difference in TSI between the two. Also if some other fully specified 
protocol uses TSI they can reuse the TSI attribute. As the protocol will 
identify if it is flute or ALC, or something else in the future I don't 
see a risk of misinterpretation. The same comment applies also to the 
channel attribute. However here something more than a=ch is probably a 
good thing to indicate that it is the number of transport channels 
rather than related to media. Maybe a=trn-ch?

I am also concerned by the use of * and no rules for the ALC/UDP 
protocol. Having something that is underspecified but no defined rules 
for how fully specified mechanisms are identified seem to be a bad 
choice. I would recommend that one uses some type of identifier space 
here. I don't think media types are the correct one, but some space 
should be set up to identify applications.

cheers

Magnus

-- 

Magnus Westerlund

Multimedia Technologies, Ericsson Research EAB/TVA/A
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