Hi Venkatesh,
The Value present in the 200 OK must be taken as expires value. REGISTER
request can ask for any duration of time (say 3600) if 200 OK contains 360
then 360 is the expires value. registrar can reduce expires value but it
must not increase the expires value which present in REGISTER request while
sending final response (200OK).
Regards,
Bhanuprasad KS
----- Original Message -----
From: "Venkatesh Joshi" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, January 18, 2007 10:44 AM
Subject: [Sip-implementors] Expiration interval in REGISTRATION sequences
Hi,
I have a situation where a phone sends a REGISTER message with
"expires=3600" in the Contact Header.
The SIP registrar replies back with "Expires: 300" in the 200 OK response.
In such a situation, which of these 2 values should be taken as the actual
expiration interval ?
RFC 3261 -> section 10.3 is slightly obfuscated.
In one instance it states that if REGISTER request has an "expires"
parameter or if the request has an "Expires" header field, that value MUST
be taken as the requested expiration.
Then, it also states that registrar MAY choose an expiration less than the
requested expiration interval.
Does this mean that the value in the 200 OK message takes precedence ?
thanks,
venkatesh joshi
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