Indeed, it seems that terminate_call() triggers ending of the dialog, which call backs
deletion of call structure from cnxcc. But after the part ending of the dialog, cnxcc
executes __notify_call_termination(&call->sip_data), accessing the data of the call
just deleted.
For me, it looks like __notify_call_termination(&call->sip_data) should be executed
before ending the dialog via MI in terminate_call(), or at least, the fake msg needed
inside __notify_call_termination() has to be built before.
Maybe @caruizdiaz can review and propose a fix, being the architect and developer of the
module.
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https://github.com/kamailio/kamailio/issues/324#issuecomment-140030661