Re: draft-ietf-sip-199 use-cases

Christer, 

> >Case 1: You're a basic endpoint or PSTN Gateways the UAC, and have to
> pick one of many 183 w/SDP responses for which to 
> >play early media for.  Typically they pick the first one 
> received, and
> don't change until the 200 ok. (some pick the 
> >most recently received one instead, but that's just guessing too)  So
> if I call Bob, and it went to a simple find-me-
> >follow-me service, the service plays "we're looking for Bob, please
> hold...".  Once it finds Bob, and Bob's phone rings, 
> >I would like my UAC to stop listening to the announcement and instead
> switch to Bob's ringback.  So the proxy needs to 
> >send my UAC the 199.
> 
> Correct. That is how many gateways/UACs work today, and one use-case
> I've had in mind where 199 could be useful. The reaons I didn't add it
> to the draft before was because it is not so much related to 
> resources,
> but more to early dialog policy, but for sure I could add it to the
> draft.
[JRE] Personally I think this is a more compelling use case.

John
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