[Freeswitch-users] premature disconnect on outbound call: destroy/unlink session from object

Neil Patel neilp at cs.stanford.edu
Thu Feb 17 21:15:39 MSK 2011

Hi All,

I am running into an intermittent problem with outbound calling. I originate
calls (using FreeTDM to Sangoma hardware) from a lua script, and every so
often (10-50% of the time) the call disconnects just as the endpoints
answers the call. I am executing these calls identically and to the same
phone number. Here is CLI output for a call that doesn't disconnect:

And here is an example of one that does upon answering on the endpoint:

I noticed that one difference is that in the disconnected call there is the
following output:

2011-02-17 23:11:48.747752 [DEBUG] switch_core_state_machine.c:204
FreeTDM/2:1/09586550654 Standard SOFT_EXECUTE
2011-02-17 23:11:48.747752 [DEBUG] switch_core_state_machine.c:372
(FreeTDM/2:1/09586550654) State SOFT_EXECUTE going to sleep
*2011-02-17 23:11:48.747752 [DEBUG] switch_cpp.cpp:981
FreeTDM/2:1/09586550654 destroy/unlink session from object*
2011-02-17 23:11:48.747752 [DEBUG] switch_channel.c:2535
(FreeTDM/2:1/09586550654) Callstate Change ACTIVE -> HANGUP

I'm wondering what's triggering that destroy/unlink. I've taken this issue
up with Sangoma support, they are saying that there is nothing from the HW
side that would trigger this, though freeTDM may possible be passing back
some variables in a way that causes this and subsequent callstate change.

In case it's useful, pcaps for the normal,connected call and disconnected
fault call are attached.

Thanks in advance,
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