Goix Walter wrote:
>
> > -----Original Message-----
> > From: Wei BJ Lu [mailto:[EMAIL PROTECTED]]
> > Sent: Tuesday, March 05, 2002 2:07 AM
> > To: [EMAIL PROTECTED]
> > Subject: Re: [Sip-implementors] SIP/SDP Multiple IP addresses
> >
> >
> >
> > If mutiple dialogs are enabled for INVITE, and the UASs at two contact
> > addresses answer the incoming call simultaneously with different SDP
> > answer, the UAC will create two dialogs with each media sent/received
> > to/from a different IP peer. The media discription of dialogs
> > caused by
> > forking are independent.
> Ok, but that only works under these conditions. If at least one of the
> UASs doesn't answer automatically and requires an human action or both
> have different response times, you won't get 2 200 answers down to the
> originating party since the first final response will automatically
> trigger a CANCEL on the pending branch. In this general case, only a
> single peer would win if there is no way for waiting/merging answers...
Correct, forking is not meant for this.
There is no way to support this in a completely distributed way, and I
am not sure you would want to. It is far easier to have a central point
of signaling control for a UA, and have that control (through mbus, for
example:
http://www.ietf.org/internet-drafts/draft-ietf-mmusic-mbus-transport-06.txt)
audio or video components. Another approach is a B2BUA that represents
all the components for a particular user.
-Jonathan R.
--
Jonathan D. Rosenberg, Ph.D. 72 Eagle Rock Avenue
Chief Scientist First Floor
dynamicsoft East Hanover, NJ 07936
[EMAIL PROTECTED] FAX: (973) 952-5050
http://www.jdrosen.net PH: (973) 952-5000
http://www.dynamicsoft.com
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