Rerouting of trunks by a PBX to an alternate PBX

摘要

A switching system that receives communications over a trunk incoming from a communications network and routes them to its subtending communications terminals responds to a stimulus, such as actuation of an actuator, by either (a) returning all of the communications that it receives on the incoming trunk at least subsequently to the stimulus to the network over a trunk outgoing to the network with instructions directing the network to redirect the returned communications to a second switching system for routing to communications terminals served by the second system, or (b) routing all of the communications that it receives on the incoming trunk at least subsequently to the stimulus to the second switching system over a trunk outgoing to the second switching system for routing to the communications terminals served by the second switching system.

主权项

1. A method comprising:
receiving communications from a communications network via an incoming trunk at a first switching system, wherein the first switching system and a second switching system together form a failover arrangement comprising an active/standby configuration of replicated switching systems; routing a first portion of the communications received by the first switching system prior to a stimulus to communications terminals served by the first switching system; in response to the stimulus received by the first switching system, the first switching system returning a second portion of the communications received by the first switching system subsequent to the stimulus via an outgoing trunk to the communications network with instructions indicating the first switching system as an origin of the returned communications and directing the communications network to redirect the returned communications to the second switching system for routing of the redirected communications by the second switching system to communications terminals served by the second switching system.