Viking RAD-1A – RAD-1 The RAD-1 allows you to call from any Touch Tone phone then remotely access 1- or 2-way paging systems, service observers, digital recorders, church programs, etc. The unit connects to any C.O., CENTREX, or PABX line, answers on the first ring and disconnects on CPC, time out, or by dialing In.#7In.. A 600 ohm output and relay contact is provided.