> -----Original Message----- > From: [email protected] [mailto:sip- > [email protected]] On Behalf Of Chandan Kumar > Sent: Monday, March 28, 2011 1:12 PM > To: [email protected] > Subject: [Sip-implementors] Query regarding Session timer > > Hi, > > Please can some one clarify the below queries regarding Session timer. > > A UAC starts sending an INVITE. This includes a Supported header > field with the option tag 'timer', This INVITE passes through a proxy & > this proxy inserts Min-SE value of 1800 . > 1. Finally the request arrives at UAS. UAS adds session-expires value > 120 in 200 ok. > Is this correct?Can UAS lower the session-expire value than Min-SE. [Neel]
RFC 4028 Section 3: The Min-SE header field establishes the lower bound for the session refresh interval; i.e., the fastest rate any proxy servicing this request will be allowed to require. The purpose of this header field Also in Section 9: If the UAS wishes to accept the request, it copies the value of the Session-Expires header field from the request into the 2xx response. The UAS response MAY reduce its value but MUST NOT set it to a duration lower than the value in the Min-SE header field in the request, if it is present; otherwise the UAS MAY reduce its value but MUST NOT set it to a duration lower than 90 seconds. The UAS MUST NOT increase the value of the Session-Expires header field. So, the endpoint which is sending 200 OK is incorrect in reducing the session-expires value. > > > 2.What should be the respone of UA when proxy queries authorization > (401 ) for the session UPDATE request? How to handle this case? > > [Neel] As you would have done for the original INVITE. > > > > > > Best Regards, > Ckumar. > > > > > > > > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
