Re: Expiration interval in REGISTRATION sequences

If the REGISTER message does not have any "expire"
parameter in Contact
and messgae does not have "Expires" header then
registrar can use it's
default value for the "expire" and send in 200 OK.

It's mandatory to send "expires" in contact or
"Expires" header. 

-----Original Message-----
From: sip-implementors-bouncescs.columbia.edu
[mailto:sip-implementors-bouncescs.columbia.edu] On Behalf
Of
Bhanuprasad K S
Sent: Thursday, January 18, 2007 1:56 AM
To: Venkatesh Joshi; sip-implementorscs.columbia.edu
Subject: Re: [Sip-implementors] Expiration interval in
REGISTRATION
sequences

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" <vjoshimerunetworks.com>
To: <sip-implementorscs.columbia.edu>
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
>
> _______________________________________________
> Sip-implementors mailing list
> Sip-implementorscs.columbia.edu
> https://lists.cs.columbia.edu/cucslists/listinf
o/sip-implementors
> 


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