1. A communication network comprising: a calling device configured to transmit a call request for an emergency call wherein the call request includes a caller identification that identifies a caller; a call processing system, in a carrier network, configured to receive the call request, transmit a key request to a location provisioning system to obtain a key, generate and transfer first signaling for the emergency call that includes the caller identification and a key, and generate and transfer second signaling for the emergency call that includes the key; and a customer information system having a plurality of context information stored in association with a plurality of caller identifications and configured to receive the first signaling for the call, process the caller identification to determine a context information from the plurality of context information associated with the caller identification, and store the key in association with the context information.