Hi Frank:
Thanks for you replying!
The state I want to get is the online state of the peer. I send
UPDATE without SDP in a dlalog so that I can get a response. If the
response is 404 or 481 or 408 or another none-2xx I think the session in
the remote peer has been destroyed. My company's Metting server dose
not support anther keep alive method, so I have to use sending UPDATE
to get that taht state.
Best Regards,
LiuMeng
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