Hi, This problem occurs not only in ReInvite but in INVITE transactions also. Its a bug in SIP and has been reported as well. In our implementation, we didnt hamper the existing timers but created a new one whose value we set > timerB. For sure the dialog needs to be terminated.
cheers!! sarvpriya (http://sarvpriyak.blogspot.com) On Tue, Jul 27, 2010 at 11:58 AM, Mia Cizmic <[email protected]>wrote: > Hi, > > in our SIP implementation, we have encountered a problem for which we > don't find a clear statement in RFC 3261. > We would like to hear your opinion about this issue, if possible. > > Namely, we have sent a Re-Invite on an existing session and received 100 > Trying reply. > 100 Trying reply turned off Timer B. After 100 Trying, we haven't got > any answer on Re-Invite. > > Chapter 14.1 of RFC 3261 says: > "If a UA receives a non-2xx final response to a re-INVITE, the session > parameters MUST remain unchanged, as if no re-INVITE had been issued. > Note that, as stated in Section 12.2.1.2, if the non-2xx final response > is a 481 (Call/Transaction Does Not Exist), or a 408 (Request Timeout), > or no response at all is received for the re-INVITE (that is, a timeout > is returned by the INVITE client transaction), the UAC will terminate > the dialog." > > Quoted paragraph does not say anything for provisional responses. > > I find our implementation aligned with the RFC (quoted paragraph and > Figure 5) but it is also evident that we can not keep waiting for the > final response forever. > > My question is which timer should control the duration of INVITE > transaction? Can Timer B me expanded and NOT switched off if provisional > response is received (Figure 5) or it would be better to implement a new > timer. If you think that a new timer is a better solution, can you > suggest it's guiding value? > > Thank you in advance, > Mia > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > -- cheers!!!! sarvpriya http://sarvpriyak.blogspot.com/ _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
