Importance

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Abstract

A method of Distributed Call Control is provided in a Distributed Transit Private Branch Exchange (PBX) comprising a plurality of Nodes forming a wide area network, and a plurality of D-channel Server Modules (DSMs). The DSMs are located in predetermined ones of the Nodes with each DSM coupled to at least one associated PBX via at least one D channel. The method includes the following steps. First, a listing of all Exchange Codes (ECs) handled by a DSM and each associated PBX coupled thereto is stored in a local routing table of a memory in the DSM. Second, a listing of all ECs handled by all of the other DSMs of the Distributed Transit PBX and their associated PBXs is stored in a remote routing table of the memory in each of the DSMs. Third, upon receiving a call request and an Exchange Code (EC) for a called PBX at a DSM from an associated calling PBX, determining at the DSM if the EC is found on the local routing table, and routing call back to the associated called PBX when a the EC is found on the local routing table. Fourth, determining if the received EC is found on the remote routing table for a remote DSM when the EC is not found on the local routing table. When the EC is found in the remote routing table, the call is routed to a remote DSM which routes the call to the called PBX.

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First Claim