Abstract: A telephone line sharing apparatus is disclosed for enabling a plurality of telecommunications devices of any type to share a plurality of single subscriber telephone lines. Incoming telephone calls on each of the telephone lines are automatically connected, without answering the telephone calls, to one or more of the telecommunications devices. These connections are made in accordance with a predetermined mapping scheme. An off-hook condition detected on any of the telecommunications devices results in a connection to a telephone line, if available, for making an outgoing telephone call.