________________________________________
From: [email protected] 
[[email protected]] On Behalf Of Vivek Singla 
[[email protected]]

1) Should the Register renewal have the empty nonce. I think it should have the 
same nonce as the INVITE.

2) Should the call be dropped after 401 for the registration renewal? I am 
thinking since the Register renewal did eventually got the 200OK, may be MTA 
should have kept the call alive.
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1) The renewal can use any nonce it prefers.  In many systems, the nonces time 
out much quicker than the time between successive registration renewals, so 
there isn't a lot to be gained by keeping the nonce around for registrations 
alone.

2) Your example is 3GPP, and it has a number of perversions.  But in ordinary 
SIP, it would be considered an error for a UA to drop a call because its 
registration failed.  Indeed, registration and making outgoing calls are 
entirely independent processes.

Dale

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