Abstract: A method for operating a switched virtual circuit call processing/routing system, and a computer readable medium containing a call processing/routing program for a voice network switching (VNS) system are disclosed. In a preferred embodiment, an adjunct processor is attached to a network node and software-configured to service the switching needs of one or more PBXs that are also tied to the network node. The service capability offered by the software-configured adjunct processor alows PBXs to establish voice and data connections between each other dynamically via Switched Virtual Circuits (SVCs) that are routed directly across a WAN. This arrangement eliminates the need for an extensive mesh of PVCs or leased “tie lines” carrying voice and data traffic between PBXs across the WAN. It also eliminates the need for routing connections in multiple hops between PBXs. Another advantage is that the number of physical interfaces required on the PBXs and the attached switches is reduced.

Abstract: A voice networking switching (VNS) appliance and methods for its use are disclosed. In a preferred embodiment, the VNS is an adjunct processor attached to a WAN node and software-configured to provide switching services for private network PBXs and PSTN central offices that have trunks ported to a WAN node. The switching services offered by the VNS allows PBXs to establish voice and data connections between each other, as well as with the PSTN, dynamically via Switched Virtual Circuits (SVCs) that are routed directly across a WAN. This arrangement eliminates the need for an extensive mesh of PVCs or leased “tie lines” carrying voice and data traffic between ported trunks across the WAN. Furthermore, private network end users can connect to the PSTN without their PBX having a direct connection to the PSTN. Likewise, a private network connection to a PSTN central office can be established in a location where no PBX is present.