[asterisk-users] Asterisk sends CANCEL to the wrong destination

Karsten Wemheuer kwem at gmx.de
Wed Dec 17 05:50:06 CST 2014


Am Dienstag, den 16.12.2014, 16:32 +0100 schrieb Karsten Wemheuer: 
> Hi,
> I got a weird behaviour in asterisk (original found in 1.8 but it is
> still the same in 11.15.0). I have three phones communicating via
> OpenSIPs with asterisk. Phone A dials 100 and asterisk calls
> SIP/phone-b. Phone B accepts the call. The User on Phone B places the
> call on hold, dials 200 and, while hearing the dial tone of ringing
> Phone C, places the handset on hook. Phone B sends a REFER, so that
> Phone A is connected with the ringing Phone C. Asterisk sends an UPDATE
> to Phone-C to update the connected line information. Now the user on
> Phone B realized that User B is not available. He presses the blinking
> LED of BLF to get the Call back. A and B are now connected again. But
> Phone C is still ringing. Asterisk sends the CANCEL to terminate the
> call to phone C not to the proxy (where the INVITE comes from), but
> directly to the phone. The phone ignores this CANCEL, as it does not
> belong to a call and so the phone keeps on ringing.
> If I modify the configuration, so that there is no UPDATE for the
> connected line information, the CANCEL is send via proxy to the phone
> and all is well.

I possibly find the source of the failure and a patch, working without
failure in my test scenario. I filed a bug with patch attached, see

Have a nice day,


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