Patent ID: 7319871

Claim:
A method for providing a handback process in a wireless telecommunication system after an inter-MSC handoff from a first MSC to a second MSC during an active call to an MS, wherein the call is routed from the first MSC to the second MSC via an inter-MSC trunk as a result of the inter-MSC handoff, the method including the steps: a) initiating an inter-MSC handback attempt from the second MSC to the first MSC in response to the MS moving into a geographic area associated with the first MSC; b) setting up resources in the first MSC and a first BS associated with the first MSC for routing the call to the MS; c) sending a command to the MS directing the MS to begin the inter-MSC handback attempt by attempting to communicate with the first BS; d) receiving a message from the MS indicating that the inter-MSC handback attempt to the first BS failed; e) cleaning up the resources set up in the first MSC and first BS for routing the call to the MS; and f) sending a message to a second BS associated with the second MSC indicating that the first MSC and first BS are ready for another inter-MSC handback attempt.