[Freeswitch-users] "481 Call/Transaction Does Not Exist" when hanging up before call connects

[Charlie Orford]

Hi list,

When we make a call from an FS extension to a PSTN number (via our ITSP 
gateway provider) and hang-up before the call completes, FS replies to 
the CANCEL request with "481 Call/Transaction Does Not Exist" and the 
call continues to ring on the remote end. If we hangup after the call 
has connected, it works with no problem.

I have looked through a SIP trace of this happening and to my (untrained 
eye) nothing seems obviously wrong (i.e. tag, call id and branch values 
all seem to be correct). I'm using the latest git snapshot from 
2011-11-30 18-14-24 -0600.

For a sip trace showing the problem, see:
http://pastebin.freeswitch.org/17908

For a sip trace showing a successful hangup, see:
http://pastebin.freeswitch.org/17909

*Note: ip addresses, domain and called number have been altered for privacy.

Any help or insight is much appreciated.

Kind Regards,
Charlie