Abstract: A telephone line access control apparatus to restrict access to an outgoing telephone line may be placed in a locked mode to restrict access to the telephone line, or in an unlocked mode to enable full and unrestricted access to the controlled telephone line. The apparatus supports the answering of all incoming calls, and when in the locked mode restricts access to the telephone line by enabling a person to dial only preselected emergency telephone numbers. The invention is configured with a filter, which may be coupled to the telephone line, as required, to restrict the dialing and placing of unauthorized telephone numbers. Another embodiment of the invention is arranged with a plug that may be plugged into a telephone jack in a secured manner so that the apparatus may only be unlocked and removed from the telephone jack by individuals having a key.