Abstract: The telephone system includes N line paging lockout printed circuit cards, where N is equal to an integer greater than one. Each of the paging lockout cards includes a first relay controlled circuit to lockout (N-1) of the paging lockout cards from a paging amplifier if any of the (N-1) of the paging lockout cards attempts to initiate a paging operation a fraction of a second after one of the N paging lockout cards has initiated a paging operation. A second relay controlled circuit applies a busy tone to a telephone subset associated with each of the (N-1) of the paging lockout cards attempting to initiate a paging operation after the one of the N paging lockout cards has initiated a paging operation.

Abstract: There is disclosed an arrangement to enable control of a function at a remote location from a local location employing two audio control signals (tones) each having a different frequency. A short burst of the two tones are injected into a telephone line at the local location. These two tones when detected simultaneously at the remote location provides an output signal from logic circuitry. This output signal triggers a timer whose output controls the function for a given period of time.