| 摘要 |
A system for use of a telecommunications voice network includes a communication node local to a calling location for acquiring calling and called party identification numbers and transmitting them to a central switching unit associated with a called location, through a transception channel independent of the telecommunications voice network. Further provided is a central switching unit for interrogating the called location to obtain a call supervision status thereof. Also provided is an apparatus for completing a first phonecall from the switching unit to the called location if the call supervision status is that of an answer, and for originating a second phonecall through the telecommunications network to the calling location. Teleconferencing of the first and second phonecalls then occurs. Further provided is an apparatus for providing an uncompleted call status signal to the central switching unit if the call status is that of a no answer or busy. The calling party is then appropriately advised. Upon termination of the second phonecall an answer supervision signal is sent by the local node to the central switching unit.
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