Inter-Network Communication Session Handoff

摘要

A communication session between a first communication device and a second communication device is hosted in an Internet Protocol (IP) based packet data network. A contact server functions as a bridge service between the first communication device and the second communication device. A communication link between the first communication device and the contact server or the second communication device and the contact server is initially a voice-over IP (VoIP) communication link over a wireless data network. The contact server analyzes a call quality characteristic of the VoIP communication link and causes the communication device having the VoIP communication link to handoff the VoIP communication link from the wireless data network to a cellular communication link on a cellular network when the analyzed call quality characteristic of the VoIP communication link crosses a threshold level. Other embodiments describe handing off from a cellular communication link to VoIP communication link.