Supported Model S412, S20, S50, S100, S300
Ring Voltage Detection 30+ VRMS (depending on the FXO mode)
Termination PSTN Lines
Echo Cancellation Support
Foreign Exchange Office: 2 way connection to PRX or key system trunk.
Foreign Exchange Station Defined Network: provides access to major carrier services.
Private Line Automatic Ringdown (PLAR)-point-to-point unswitched connections.