To configure it is quite simple.
On ProSim737System, you don't need to do anything.
For each ASP, you will need a ProSimAudio instance running. It can be combined with any already existing instance.
Two simple steps are required:
- Select Intercom channel

You need to select which position each instance will handle. Capt, FO or OBS. NAV audio is also required to be selected on the same channel.
- Select audio devices for input and output elements

There are 3 inputs:

And 2 outputs:

And that's it. You can now use your ASP to control the intercom

Note that some ASPs on the market have limited functionality, so if your hardware does not have a functional SPKR knob, the SPKR output will not work.
This should give a quick glimpse on how to configure the intercom.
Regards