William Owen posted this Shaggy Dog on the Central Oklahoma Radio Control Society home page. He received it from Bill Baker, though the author is unknown.

It is common practice in England to ring a telephone by signaling extra voltage across one side of the two-wire circuit and ground. When the subscriber answers the phone, it switches to the two-wire circuit for the conversation. This method allows two parties on the same line to be signaled without disturbing each other.… Read the rest...