Hi, I have another question regarding Session Timer:

If the refresher is uac, how can the uas determine the re-INVITE is
for the purpose of session refresh?  (assuming uas needs to tell the
difference between a Session Refresh re-INVITE and other purpose
re-INVITEs so that it can pursue different process. )

There could be re-INVITEs that are Target Refresh Request (RFC3261
12.2), and re-INVITEs that change SDP.

My idea is to determine by checking if the header part contains
"Supported: timer", but I am not sure this condition is good enough.

I will appreciate very much for any convincing opinion. 

Christina
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