Control device for forwarding incoming call from mobile phone to phone set coupled to public telecom network

摘要

A switch device for forwarding an incoming call from a mobile phone to a phone set coupled to a public telecom network, allowing the user to answer the incoming call of the mobile phone by a phone set, is disclosed. The switch device includes a central processing unit, a communication loop switching circuit for establishing a communication loop for the phone set, a relay controllable by the central processing unit, an incoming call detecting circuit for detecting the incoming call of the mobile phone and correspondingly generating an output signal to the central processing unit, an audio signal converting circuit for converting the audio signal carried on the earphone connecting lines and the microphone connecting lines of the mobile phone into an audio signal form adapted to be coupled to the phone set, and a power supplying circuit for supplying a power source to the audio signal converting circuit. The switch device further includes a ring generation circuit for generating a simulating ring signal when the incoming call is detected by the incoming call detecting circuit.