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