You mean the signalling should be multicast as well? That will cause a lot of problems. I think it should be possible to set the group up using TLS, so that no one in the middle would see the parameters of the paging group (e.g. SRTP key).
CS > -----Original Message----- > From: Mudigonda, Saisrikiran [mailto:[EMAIL PROTECTED] > Sent: Wednesday, June 07, 2006 3:46 AM > To: Mudigonda, Saisrikiran; Christian Stredicke; > [email protected] > Cc: CTO YAN Renxiang > Subject: RE: [Sip-implementors] How to create a multicast > session using SIP? > > Sorry typo. > > B can then send an INVITE (not SUBSCRIBE) > > > -----Original Message----- > From: Mudigonda, Saisrikiran > Sent: Wednesday, June 07, 2006 12:43 PM > To: 'Christian Stredicke'; [email protected] > Cc: CTO YAN Renxiang > Subject: RE: [Sip-implementors] How to create a multicast > session using SIP? > > We could use an initial INVITE for A to join a multicast > session with maddr parameter in the Request-URI. > > When A wants B to join the same multicast conference as he is > subscribed to, he can send an INFO message with the required > multicast session information. B can then send a SUBSCRIBE > message to the multicast address specified in the INFO message. > > Or > > A could send an INVITE to B with a JOIN header containing the > multicast address. > > Thanks, > Sai. > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf > Of Christian Stredicke > Sent: Wednesday, June 07, 2006 6:44 AM > To: [email protected] > Cc: CTO YAN Renxiang > Subject: Re: [Sip-implementors] How to create a multicast > session using SIP? > > I think we need to seriously take a look at this. > > IMHO, the source needs to set up a dialog a long time before > the actual paging can start. Otherwise, there will be a burst > of INVITE which will make this difficult in offices with lets > say 1000 phones. Then the phone must listen to the multicast > group all the time and play the annoucement whenever there is > a paging going on. > > I think the SDP would look like this: > > v=0 > o=carol 28908764872 28908764872 IN IP4 224.3.4.5 > s=- > c=IN IP4 224.3.4.5 > t=0 0 > a=multicast-recvonly > m=audio 3000 RTP/AVP 0 > a=rtpmap:0 PCMU/8000 > m=audio 3002 RTP/AVP 3 > a=rtpmap:3 GSM/8000 > > I think we need an attribute like the "multicast" (just a > wild guess) that indicates that the UA should just listen to > that group and not send any media to the group. > > In the example above, the phone could tune into PCMU or GSM > codecs on different ports. > > Any other ideas? > > > Christian > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf > Of CTO YAN > > Renxiang > > Sent: Tuesday, June 06, 2006 4:01 AM > > To: [email protected] > > Subject: [Sip-implementors] How to create a multicast session using > > SIP? > > > > Hi, all, > > > > How to create a multicast session using SIP? Is the following > > description correct? Two kinds of case: > > Case (1) A invites B to join a multicast session. > > -A sends a INVITE to B, the multicast address is included > in SDP part > > of INVITE message. > > -B will then join the session by sending an IGMP to join the > > multicast session. > > -but when will A join the session? > > > > Case (2) A joins a multicast session independently. > > A sends INVITE to whom? when send IGMP join message? > > > > Other cases? > > > > Regards, > > Renxiang <mailto:[email protected]> > > _______________________________________________ > > Sip-implementors mailing list > > [email protected] > > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > > > > > > > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
