On Tue, May 19, 2009 at 4:15 PM, Dale Worley <[email protected]> wrote: > On Tue, 2009-05-19 at 15:47 -0400, M. Ranganathan wrote: >> Hello, >> >> Attached is a trace for a test which is configured to do the following: >> >> Request from INVITE is directed to a dial plan (extension 501) which >> parallel forks to two extensions 201 and 202. Each of those extensions >> has an unconditional call forwarding to the SAME ITSP number. JAIN-SIP >> detects the loop and responds to one of the call legs with LOOP >> DETECTED ( Frame 91 ). >> >> However, by this time the ITSP (PSTN) phone is ringing. >> >> Shortly thereafter, SIPX PROXY sends a CANCEL. This CANCELs the >> original call. Questions: > > The INVITE to sipxbridge is frame 86 at 19:20:49. > > The CANCEL to that invite is frame 122 which is at 19:20:59, which is 10 > seconds later. This is enough to suggest that the CANCEL is due to an > event which is asynchronous to the INVITE. > > The CANCEL propagates from CANCEL frame 116 at 19:20:59, which cancels > the INVITE at frame 57 at 19:20:49. > > Generally, the conditions that cause a CANCEL to be created are set up > not by the INVITE that it cancels, but by the parent INVITE. In this > case, looking at the *second* branch value of frame 57 and scanning > upward, we discover the parent INVITE is frame 23, INVITE sip:us...@..., > 19:20:29, which has "Expires: 30". And CANCEL frame 116/122 is at > 19:20:59, which is 30 seconds later. > > So the immediate cause of the CANCEL is that the INVITE to user1 has a > 30 second expiration, and it takes 20 seconds before the INVITE > propagates to sipXbridge. That latter appears to be because the call > goes to two phones before getting routed to sipXbridge.
Ah! Makes perfect sense. I changed the expiration time and it worked as expected. Thanks ! Ranga > > Dale > > > -- M. Ranganathan _______________________________________________ sipx-dev mailing list [email protected] List Archive: http://list.sipfoundry.org/archive/sipx-dev Unsubscribe: http://list.sipfoundry.org/mailman/listinfo/sipx-dev
