Hi,
SSM Scenario:
In a single-source multicast model (SSM), each participant sends its media stream to a central point, using unicast. The central point then redistributes the media to all participants using multicast.
My question is how must a SDP be constructed if a participant wants to join a conference. As the participant receives multicast he doesn't need to provide a unicast contact in his offer. He only needs the answer from the conference focus to know where to send his unicast stream and the mulicast announcement.
So, is should really the offer/answer model be used for that scenario? Or does the participant sends a blank SDP to the focus and the focus consucts a SDP with the multicast media description and the unicast media description for reception?
I couln't find any information in the RFCs and IETF drafts.
regards, Michael... _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
