I’m trying to test longer duration calls to an IVR system:  Call is placed, 45+ seconds of audio is played and the IVR hangs up the call.  The issue is that SIPp does not receive (or ignores) the BYE being sent at the end of the call.  I have the recv timeout for BYE set to 100 seconds, and the calls are reported in the “Timeout” column.  Looking at the SIP messages, the BYE messages are being sent, and if I decrease the time of the IVR to below 20 seconds, it works fine.

Any help will be much appreciated!