Abstract: A communication exchange including a digital route module, an analog route module and a call manager is presented. The digital route module transmits a call signal of a call as the call signal is a digital signal. The analog route module transmits the call signal as the call signal is an analog signal. The call manager has a processor for identifying the call alternatively occurring in the digital route module or the analog route module. The call manager also selects alternatively the digital route module and the analog route module to send the call signal to a destination of the call. Wherein the digital route module together with the call manager are used for signals transmission among the plurality of digital devices, and the analog route module together with the call manager are used for signals transmission among the plurality of analog devices.

Abstract: A signal integration system for integrating signals of public switched telephone network (PSTN) and Internet protocol (IP) is provided. The system includes a wireless local area network and a signal switch device. PSTN signals can be converted to IP signals via the signal switch device and IP signals can be also converted to PSTN signals via the signal switch device.