Private telephone network connected to more than one public network

Abstract From the Canadian patent

In conjunction with a data communication network (53) carrying multiple telephony signals and allowing for connection of telephone sets (17) a system , and method in which two external feeders (55a 55b) connect to the data , network (53) at two distinct points via two distinct devices. The data network can be based on dedicated wiring or can use existing in premises medium such as telephone, powerlines or CATV wiring. In the latter case the wiring can , still carry the original service for which it was installed. The external telephone connections can be based on the traditional PSTN CATV network, cellular telephone network or any other telephone service provider network using specific …