Keep the unit away from other electronic devices like microwaves or fluorescent lights that may cause interference.
While specific steps vary, standard RCA ViSYS models typically support station-to-station intercom and call transfer capabilities. Standard Setup & Programming Rca 25204Re1 Manual
For deeper technical support or complex system programming, you can access the full RCA 25204 Manual at ManualsOnline or view related specifications on Manua.ls . Keep the unit away from other electronic devices
Allows for 3-party conferencing by connecting two separate outside parties on one call. Rca 25204Re1 Manual