- Viking RAD-1A Remote Access Device - 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 "#7". A 600 ohm output and relay contact is provided.