This script works well but it is a bad workaround to the main problem.
i added its execution to the call end dbus event, and in most cases it works - in some it doesn't, but the main issue is that it is reproducible almost every time when the calls end (my recorder widget is configured to record all calls automatically). if i disable the recording it does not happen again.

I want to make a script to record the calls myself and stop using this widget. If anyone knows what modifications i need to do to the script posted in the 1st post it will be great.