[BLISS] draft-bliss-shared-appearance: Call state update in SUBSCRIBE mode

["Francois Audet" <audet at nortel.com>]

> Good catch.  The draft is silent on this right now, so I've 
> marked it as 
> an open issue.  One one hand, I'd prefer to have only one mechanism 
> (PUBLISH) for selection/seizure.  On the other hand, if the 
> Appearance 
> Agent has subscribed, and the UA is sending NOTIFYs, it hardly makes 
> sense to mix PUBLISH into it.

I believe the approach of using SUBSCRIBE instead of PUBLISH in this case
makes much more sense.