hang this action "Unknown number detected", configure as needed
If you apply the above action, then everything is correct - the task will not be created, since the counterparty is in the database
Action "Unknown number detected" - will create a task with acc. settings in action
To do this, we hang one more action "Create a process based on a missed call" after the above
http://i.imgur.com/IZQ6n5p.png which will create 1 more task with resp. settings
This text can be added either as a comment using automation at the first stage of the selected BP or in the task description in the action settings