Patent ID: 8213590
Filing Date: 2012-07-03
Classification: H04M

Abstract:
1. A method of operating a call control system, the method comprising: receiving a first access request from a communication system requesting access to a voice service, wherein the first access request comprises an off-hook notify message; in response to receiving the first access request, transferring a rejection to the communication system that indicates that the voice service is not available; in response to transferring the rejection, receiving a first call request for a priority service from the communication system; processing the first call request to determine if the first call request indicates the priority service; if the first call request indicates the priority service, then transferring a second access request to a communication network in response to the first call request, wherein the second access request comprises an out-of-sequence off-hook notify message representing a high priority call request; in response to transferring the second access request to the communication network, receiving a first successful response from the communication network; and in response to receiving the first successful response, transferring a second call request to the communication network.