Simple set up for using a digital hybrid.
In both of the following setups, the host microphone uses the AUX send to adjust the loudness going to the caller. The "caller" audio on the next input is NEVER sent to the AUX send. [ This creates what is called mix minus for the hybrid. ]
If more than one microphone is used in the studio, then each microphone should use the AUX send so that the caller can hear.


Setup using a hybrid designed to connect through the hand set of a telephone.

The hybrid is connected to the telephone base where the handset normally plugs in and the handset is plugged into the hybrid. Then the call is taken, the handset is dead and all audio goes through the hybrid.


Setup using a hybrid designed to connect directly to the wall.

A telephone can be connected through the hybrid to initiate a call or answer and then is disconnected by the hybrid when the call is taken and all audio goes through the hybrid.

Basics of telephone recording

NOTE:
If you want to do post production work on the recording, then you may want to pan the host microphone to one track and the caller audio to the other. You can then adjust levels or eq on each track and then combine them for the finished program.