> -----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...
Laurent Walter Goix > > ------------------------------ > Dr. LU Wei > Staff Research Member > Infrastructure Technology > IBM China Research Lab > > > > > > Goix Walter > > <[EMAIL PROTECTED]> To: > [EMAIL PROTECTED] > Sent by: cc: > > [EMAIL PROTECTED] > Subject: [Sip-implementors] SIP/SDP Multiple IP addresses > > lumbia.edu > > > > > > 2002-03-05 03:49 > > Please respond to Goix > > Walter > > > > > > > > > Hi all, > > I was wondering if there is any mechanism in SIP to set up a > multimedia > session where each media is sent/received from/to a different IP peer > (identifying the same SIP user). > Let's imagine that A wants to establish a multimedia session with B > providing different media (audio and a slide-show for example). B is > registered in 2 different locations (B1 & B2) where B1 only supports > audio and B2 only has the slide-show capability. In this case > there will > never be a full 2-media session between A and B, although B's > locations > could handle both streams together. > > As far as I understand, SDP does support different IP > addresses through > a combination of c=/m= lines. That could be fine for a kind of > SIP-enabled media controller that wants to get a media locally and > another one on the device it controls, but I don't see any > way of doing > that between independent SIP devices. Do I miss something? > > I see some solutions mainly using a B2BUA, but they are all much more > complex and inadequate...Isn't there any lighter alternative? > > > Thanks for your comments/suggestions. > > Regards, > Laurent Walter > > _________________________ > Laurent-Walter Goix > Telecom Italia Lab - StarSIP > Mobile - Network Intelligence > Via Reiss Romoli 274 > I-10148 Torino (Italy) > Tel. +39 011 228 5046 > Fax +39 011 228 5069 > E-mail [EMAIL PROTECTED] > __________________________ > Visit us @ www.starsip.com ! > > > _______________________________________________ > Sip-implementors mailing list > [EMAIL PROTECTED] > http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > > > > > _______________________________________________ > Sip-implementors mailing list > [EMAIL PROTECTED] > http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
