Hi,
The big picture is - calls are not lasting longer than 5 minutes.

This is what is happening,

My Sip Software X and Proxy (deltathree) both support Session Timers. 
The Proxy's first 200 OK (to my Initial Invite) contains Refresher = 
"uas" with Session-Expires 600.
After 5 minutes (half of 600 which is correct) the Proxy sends me a 
re-invite ( a session refresh invite) which contains Session-Expire:3600 
and Refresher = "uac" (Alert: Earlier in the 200Ok it was "uas") and now 
when I respond with the 200 OK the Proxy does not respond hence 
connection dies.

Is the Proxy Behaviour Correct?
What am I supposed to do it from my end

looking forward towards a positive reply

thanks
Mandeep Ahuja

p.s I have the ethereal traces if required.
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