Controller for telephone ring

The invented ringing controller is mainly composed of a microcontroller, a double tone multifrequency decoder, a ringing detecting circuit, an analog hook-off circuit, a called subscriber hook-off detecting cirrcuit, phoneme circuit and music circuit. It is suitable for sharing a telephone number by multiple subscribers. In accordance with the phoneme cue, the caller can select different keys to make the receiving side can differentiate the called object of the caller form the different ringing sounds and music. Thus the unconvenience of bridging telephone can be avoided. Said invention features compact structure, rational design, stable property, convenience for installation and application, and easy to implement.