1. The method of communicating with a private or public telecommunications system; the method comprising: interfacing with the network elements which comprise a public communication network, wherein the network includes network elements consisting of at least one switching center, and an intelligent network that includes a number of network elements having a service switching function or service control function; interfacing with the network elements which comprise a private communication network, wherein the network includes a private branch exchange in which access is provided between the public communications network and the private network over at least one interface; utilizing the native communication protocols supported by the network elements located in the domain of both the public communications network and private network.