Re: [Sip-implementors] SIP Session Refresh RFC 4028

[Sundbaum Per-Johan (Telenor Sverige AB)]

Hi !
Details about refresher is missing in your description, but I believe that 
B2BUA should accept UAS(B) value !

As per RFC 4028, following is the behavior of UAS.
9.  UAS Behavior
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.

BR/pj


Sensitivity: Internal

-----Original Message-----
From: sip-implementors-boun...@lists.cs.columbia.edu 
<sip-implementors-boun...@lists.cs.columbia.edu> On Behalf Of Basu Chikkalli
Sent: den 6 augusti 2020 13:22
To: sip-implementors <Sip-implementors@lists.cs.columbia.edu>
Subject: [Sip-implementors] SIP Session Refresh RFC 4028

Hi All,

A--------------------->B2BUA------------------------>B

A-Party does not support session.
      no Session_Expires,no Min-SE and no Supported:timer
      So no session refresh between A and B2BUA.

When B2BUA supports timer.
It sends INVITE to B with following details
B2BUA-------INVITE---------->B
Supported : timer
Session_Expires : 840
Min-SE : 360


B2BUA<<--------200-OK----------B
Supported:timer
Session_Expires:240
Min-SE: 120

  The B2BUA not obeying B' session_expires and starts timer on 840 sec.
   resulting B-Party sending BYE to the session after it's timer expiry.

Should B2BUA should start timer on B's session_expires value (240sec) or it's 
own session_expires (840)?

Thanks
Basu
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