System and method for selectively coupling various communication devices through common channel

A method for selectively coupling a subscriber line port of a telephone system to one of a plurality of voice communication devices including a fixed network communication module, an internet-based phone module, and a wireless internet-based phone module, the telephone system including at least one phone unit connected thereto, comprising the following steps:

• (a) connecting the fixed network communication module, the internet-based phone module, and the wireless internet-based phone module to a microprocessor via a fixed network communication module interface, an internet-based phone module interface, and a wireless internet-based phone module interface respectively;
• (b) connecting the fixed network communication module, the internet-based phone module, and the wireless internet-based phone module to a common channel, and connecting the common channel to the microprocessor via a ring current generator, and connecting the common channel to the telephone system;
• (c) connecting a computer network linking circuit to the common channel;
• (d) connecting a computer communication switching circuit to the microprocessor, the computer communication switching circuit being adaptive to couple or un-couple the computer network linking circuit to the common channel under control of the microprocessor;
• (e) connecting a two-wire to four-wire converting circuit between the computer network linking circuit and an audio processor;
• (f) connecting a tone decoder between the microprocessor and the common channel;
• (g) connecting a dialer to the microprocessor, the dialer being adaptive to generate a dialing signal or a line-busy signal to the fixed network communication module, the internet-based phone module, and the wireless internet-based phone module under control of the microprocessor;
• and
• (h) when the phone unit of the telephone system dials a called end phone number corresponding to one of the fixed network communication module, the internet-based phone module, or the wireless internet-based phone module, the telephone system is connected to the common channel, a ring current generated by the ring current generator is then supplied to the phone unit, the called end phone number is decoded by the tone decoder, and thereby the microprocessor in correspondence to the called end phone number couple the telephone system to one of the fixed network communication module, the internet-based phone module, or the wireless internet-based phone module to establish a voice communication therebetween according to a preset data table stored in the memory.