Patent ID: 8462637
Filing Date: 2013-06-11
Classification: H04M

Abstract:
1. A method comprising: providing an enterprise network having geographically dislocated first and second network regions, wherein the first and second network regions are in communication with one another through first and second intermediate networks and, respectively, comprise first and second gateways and a plurality of communication devices; in a first operational mode, controlling, by a common media server, the first and second network regions, wherein a majority of bearer channels for voice calls are routed over the first intermediate network; the first network region receiving, from a first communication device of a first subscriber located in the first network region, a request to initiate a voice call to a second communication device of a second subscriber located in the second network region, the request comprising an abbreviated dial string including a directory number associated with the second communication device; the first network region determining that the enterprise network is in a second operational mode, wherein the second operational mode corresponds to a state where a network failure has occurred and the first subscriber in the first network region is unable to directly dial the second subscriber in the second network region using the abbreviated dial string and the second network region is under control of a spare media server instead of the common media server; in a dial plan, mapping, by the first network region, the abbreviated dial string to a corresponding electronic address for the second communication device, the corresponding electronic address having more digits than the abbreviated dial string and being in a form addressable over the second intermediate network; and the first network region including a primary media server that, using the corresponding electronic address, routes the voice call over the second intermediate network to the second communication device, wherein the first intermediate network is packet switched, and wherein the second intermediate network is circuit-switched; and after the call is routed over the second intermediate network to the second communication device, at least one of the first and second network regions transmitting in-band feature information, wherein the in band feature information is a reason code.