The old crossbar and step-by-step switches definitely had trap and trace and pen register capabilities. The later electronic switching systems carried the capabilities forward. Nuisance and prank calls just weren’t worth the effort to obtain the necessary court orders and set-ups to trace. Later generics (operating systems) of the ESSs implemented services such as caller ID and redial the last call.
It used to be that one of the fastest ways to get fired by Ma Bell was unauthorized disclosure of call records.
The old crossbar and step-by-step switches definitely had trap and trace and pen register capabilities. The later electronic switching systems carried the capabilities forward. Nuisance and prank calls just weren’t worth the effort to obtain the necessary court orders and set-ups to trace. Later generics (operating systems) of the ESSs implemented services such as caller ID and redial the last call.
It used to be that one of the fastest ways to get fired by Ma Bell was unauthorized disclosure of call records.