Mangle self.cancel when we are in the _run_once routine, so if that cancel is called here it would not call reactor's cancel on event that has not been scheduled yet.
Mangle self.cancel when we are in the _run_once routine, so if that
cancel is called here it would not call reactor's cancel on event
that has not been scheduled yet.

sippy/b2bua,sippy/b2bua