Patent ID: 7051104
Filing Date: 2006-05-23
Classification: H04L

Abstract:
1. A method for a first device to reestablish a link between the first device and a second device, comprising: transmitting an ITU Recommendation Q.921 disconnect request message from the first device in ITU Recommendation Q.922 terminal equipment identifier (TEI) assigned state (state 4) to the second device in response to the link between the first device and the second device going down; starting an awaiting response timer to start; upon any of expiration of the awaiting-response timer, receiving an ITU Recommendation Q.921 disconnect mode message from the second device, or receiving a Q.921 acknowledgement message from the second device, transmitting an ITU Recommendation Q.921 request for connection to establish link from the first device to the second device; after transmitting the disconnect request message to the second device and upon receiving an acknowledgement message from the second device, determining if an awaiting-response-to-the-disconnect-message flag is set; and transitioning the first device to ITU Recommendation Q.922 (state 5); wherein the first device transmits the request for connection to establish link to the second device upon receiving an acknowledgement message from the second device only if the awaiting-response-to-the-disconnect-message flag is set.