Patent ID: 8060056
Filing Date: 2011-11-15
Classification: H04M

Abstract:
1. A communication network comprising: a device configured to place a call for an emergency service; a call processing system in communication with the device and configured to receive and process the call to route the call to a public service answering point (PSAP), initiate a location determination process, and terminate the call; a location provisioning system configured to execute the location determination process to determine a location of the device and provide an emergency service key for the call to the call processing system and the PSAP, wherein the location provisioning system comprises a plurality of redundant sub systems configured to determine the location of the device and share a pool of keys; a first sub system of the plurality of redundant sub systems configured to select a first key from the shared pool of keys to provide as the emergency service key, wherein the selection of the first key from the shared pool of keys restricts the first key from the shared pool of keys for subsequent use by the first sub system and a second sub system of the plurality of redundant sub systems; the call processing system configured to communicate with only the first sub system of the plurality of redundant sub systems to initiate the location determination process and communicate with the first sub system and the second sub system of the plurality of redundant sub systems to terminate the call; and in response to the communication from the call processing system to terminate the call, the first sub system and the second sub system are configured to release the first key back into the shared pool of keys for subsequent use.