Comments inline... Thanks, Nataraju A B > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On > Behalf Of kavitha menneni > Sent: Friday, May 23, 2008 6:17 PM > To: [email protected] > Subject: [Sip-implementors] Refresher not received in > session-expires headerof 200OK for INVITE > > Hi, > I have a query regarding the Session Timer. Please find the > call flow below and let me know what should be he UAC and UAS > Behavior. > > INVITE( Session-Expires: 120;refresher=uas) | > |------------------------------------------------------------- > -------------------->| > | 100 Trying > | > > |<------------------------------------------------------------ > ---------------------| > | 180 > | > > |<------------------------------------------------------------ > ---------------------| > | 200 (Session-Expires: 1800) | > > |<------------------------------------------------------------ > ---------------------| > | ACK > | > > |------------------------------------------------------------- > -------------------> | .Here though the RFC says "The UAS > MUST set the value of the refresher parameter in > theSession-Expires header field in the 2xx response". 200Ok > is received with our refresher parameter but INVITE has set > the refresher as uas. > > Can any one suggest what should the UAC should perform here - > 1. Set the Refresher to Local i.e uac and perform the Refreshes. > 2. Keep the refresher as uas itself and do not perform the > refreshes and send the BYE after session expiry. [ABN] UAS is little bit violating the rfc4021 mandation, but for UAC perspective, it would be better to accept this call and go on... Probably decide to go with refresher as UAC is a better option... Specifying refresher=uas in INVITE request is a query, but not a mandation. Anyway there is definitely no need for disconnecting the call...
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