Attila Sipos wrote:
> Any re-INVITE or UPDATE (provided it contains the correct Session Timer
> headers) will refresh the session.
I'd clarify that:
Any successful re-INVITE or UPDATE will redetermine whether a session
timer is in effect and if so establish a new value for the timer.
So if the call is put on hold and nobody remembers to reestablish the
session timer, then it is gone.
Paul
> offer-answer exchange is not relevant with respect to refreshing
> the session. In other words, SDP content has no effect on the session
> refresh timers.
>
> Regards,
>
> Attila
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of
> [EMAIL PROTECTED]
> Sent: 13 December 2006 11:10
> To: sip-implementors@cs.columbia.edu
> Subject: [Sip-implementors] Query related to Session timer
>
>
> Hi,
>
> If normal Re-invite or UPDATE are processed after session timer is
> negotiated in call, will it extend the session interval for refresh.
>
> For example, A and B negotiates 3600 seconds for session refresh and A is
> the refresher.
> Suppose A holds after 500 seconds,i.e A send Re-invite to B, will that
> reinvite refresh the session interval on both A and B.
>
>>From my understanding, session interval will not be refreshed if Re-invite
> or UPDATE do not contain Session-Expires header.
> Also, I have seen many UAs not implementing origin field of SDP to
> indicate the session refresh Re-INVITE as only session refresh and not
> offer-answer exchange. Does it mean then both session timer fnctionality
> and offer-answer exchange has to be done for the session-refresh REINVITEs
>
> Please let me know if my understanding is correct.
>
> Thanks,
> Udit
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