Probably a bit silly. You don't need an invitation to a multicast, in that if you know the multicast address, you can listen-in. So, if you had the information, you don't do any signalling.
Of course you want to know how you get that information. First of all, if it's a one way piece of streaming media, RTSP may be a better signalling system. If you want to use SIP, you can, but you have to model it as some sort of conference. To get into the conference, either the conference sends you an INVITE, or you find out how to address the conference and send it an INVITE. In both cases you will get the SDP description of the media stream with the codecs, multicast addresses, etc. Now, can you send yourself an INVITE? Nothing stops you but your implementation. Some do, some don't. Specs are silent on the matter. In our first pass systems it worked, and was useful. In our second pass systems, we disallowed it because it would have taken a bit more code to handle some corner cases and we didn't bother. I kind of miss it, but it isn't a customer requirement. Brian > -----Original Message----- > From: Baniel Uri-CUB001 [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, July 02, 2002 2:15 PM > To: [EMAIL PROTECTED] > Subject: RE: [Sip-implementors] Self invitation > > > So is the question below just too silly... or too difficult? > > ============================================================== > ========= > Uri Baniel - Distinguished Member of Technical Staff - Motorola > Tel: (847) 632 4616; Fax: (847) 632 3963; > "Learning that does not daily increase will daily decrease. - EWC > ============================================================== > ========= > > > -----Original Message----- > > From: Baniel Uri-CUB001 [mailto:[EMAIL PROTECTED]] > > Sent: Friday, June 28, 2002 7:42 AM > > To: [EMAIL PROTECTED] > > Subject: [Sip-implementors] Self invitation > > > > > > Say a UA wants to invite itself to a multicast session, would > > he need to > > have a prior knowledge about the media (mcast addressing, > > encoders etc) and > > then just send it to itself in the SDP element? Can a UA > > invite itself to a > > Unicast session (e.g. for testing purpose)? > > > > ============================================================== > > ========= > > Uri Baniel - Distinguished Member of Technical Staff - Motorola > > Tel: (847) 632 4616; Fax: (847) 632 3963; > > "Learning that does not daily increase will daily decrease. - EWC > > ============================================================== > > ========= > > > > > > _______________________________________________ > > 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
