Telephone communication system

Details Telephone communication system Telephone communication system

H - Electricity

04

M

344/13

H04M 3/42 (2006.01) H04M 3/533 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2022954

The present invention provides a distributed architecture that includes multiple voice processing units. A voice processing unit is designated as a home voice processing unit for a subscriber's messages. An incoming call or access by a subscriber from a central office is preferentially switched to the home VPU by a digital switching system under the control of a master control unit. If the master control unit determines that all lines to the home voice processing unit are busy or the voice processing unit is otherwise unavailable, the master control unit causes the digital switching system to switch the call to another or remote voice processing unit. The remote voice processing unit then handles the call by either locally storing a message or retrieving a message from the home voice processing unit storage over an internal message bus. If a message is stored remotely and the home voice processing unit is processing the subscriber request, the home voice 2 processing unit can access the remote message over an internal message bus or the master control unit can switch the call routing through the digital switching system to the remote voice processing unit for processing of the remote message and return the digital switching system routing to the home voice processing unit when finished with the remote message. Each voice processing unit stores both remote and home messages locally on local disc storage units. The master control unit stores subscriber related information such as the home voice processing unit for each subscriber and the location of each message for that subscriber. Communication between the master control unit and the voice processing units is over an internal network. A hot standby master control unit is provided to take control of the system in the event that the primary master control unit fails.

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