Patent ID: 8725106
Filing Date: 2014-05-13
Classification: H04W

Abstract:
1. A method of operating a voice call continuity (VCC) application server (AS) to reduce communication silence when handing off a mobile device between different types of wireless access networks, the method comprising: receiving a session initiation protocol (SIP) message addressed to the VCC AS, the message containing routing information indicating that the message is to initiate intertechnology handoff of a mobile device; responding to the received SIP message by sending a first message to an endpoint with which the mobile device is engaged in a call session, the first message indicating that a new bearer path is to be established; and sending a second message to a mobile switching center (MSC) indicating progress of a call, wherein said sending the first and second messages is timed such that the first and second messages will be received within a predetermined time interval by the endpoint and by the MSC respectively.