[Sip-implementors] How to create a multicast session using SIP?

[CTO YAN Renxiang]

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:sip-implementors@cs.columbia.edu> 
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