What can the Flight Attendant Panel do?
Here is an interesting presentation that discusses most of the communications systems on the A320 family (looks like the pictures you have and should apply in general). The CIDS (cabin intercommunication data system) starts about halfway through on page 21. The FAP is part of this system and can control:


Passenger reading lights
Passenger call buttons
Cabin lighting controls
Cabin system monitoring/testing
Passenger entertainment system
Passenger address (PA)
Automatic announcement and boarding music
Cabin/Service interphone and calls
EVAC signal
Emergency light
Door bottle pressure monitoring (either oxygen or escape slide?)
Door proximity sensors (doors closed properly)
Smoke detection
Water and waste tank quantities


The acronyms you listed are:


Cabin Assignment Module (CAM)


All the software for specific customer layouts and defined parameters in the FAP (same as OBRP).

On Board Replaceable Module (OBRM)


This is a generic term for any module that is easily replaceable. In this case it refers to the module that contains all the information used by the FAP (same as CAM).

Prerecorded Announcement and Music (PRAM)


A good list of Airbus acronyms including these can be found here.