Live Monitoring a user not a call

Instead of live monitor (listen) to a call, it would be great if you could monitor (listen) to all calls from a user instead of "dial in" to each call.

The use case is, that we have coaches who listen to our calls from our users e.g. one hour. Currently they need to "dial in" in every call individuell. If the could "dial in" just in the beginning and then listen to all calls until they disconnect would save a lot of clicks and missed beginnings of conversations.