Hi,
If user A sends INVITE msg to proxy P and it forks this msg to user B1 and
B2.
After B1 and B2 reply with provisional response with different To tag.
If user A decides to cancel this call, it sends CANCEL msg without To tag to
proxy P
1. Does proxy P need to add different To tag in the CANCEL msgs it sends to
B1 and B2?
2. Proxy P needs forward both 487 msgs from B1 and B2 to user A with
different To tag, is it true?
3. Do b1 and b2 need to add To tag in the 200 response(for CANCEL) ?
4. When should the proxy P send 200(for CANCEL) to user A?
After it receives both 200 msgs from b1 and b2, is it true?
Regards
Steven
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