Hi Please refer Section 7.2 of RFC 4028.
If the UAS did not include a SE header in 200 OK response, it means that it does not want / support session expiration. In this case, UAC can perform refreshes but for its own benefit only. UAC should behave as if the 200 OK response contained refresher as 'UAC'. However, UAC can also choose not to send any season refresh requests. Ideally the ReInvite sent by UAC should be processed as any ordinary ReInvite. If the version number in the 'o' line in SDP did not change, the UAS can effectively treat the ReInvite as a no-operation. Not sure why the UAS is sending 408 in this case. Is the UAC sending BYE on receipt of 408 for ReInvite? Regards Tarun Gupta On Wed, Jul 22, 2015 at 10:37 pm, NK <nitinkapo...@gmail.com> wrote: Dear All, I need your help to understand a logic behind the session expires. My doubt is. --> Invite have "session-expire" header in Invite (from UAC to UAS) --> UAS did not included "session-expire" header in 200 OK to the correspondence of initial invite. 1) So in this case what we should assume, they accepted the sent value or not? 2) If that UAS accepted the value we forwarded (1800 seconds) to them in invite, however they did not reply whereas in invite our switch sent the "refresher = uas" so in that case do our switch will send the re-invite to them before timer expires or there is no need to send re-invite for target refresh. --> In our case we sent the invite with session expire to vendor but vendor did not include any session expire value, and before time expire our switch sent the re-invite to them despite knowing the fact that we never received session expire in 200 OK from them (means there is no expiration is for this session), but vendor replied with sip 408. --> When we tried to explain them this problem they said we never agreed on session expire in 200 OK so BYE is not legal. Please help on this. Thank you in advance. Regards, Nitin Kapoor _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors "DISCLAIMER: This message is proprietary to Aricent and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error, please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. Aricent accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus." _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
