System and Method of Transitioning Between Cellular and Voice Over Internet Protocol Communication

摘要

A computer implemented method includes determining, at a Wireless Local Area Network (WLAN) base station, that a mobile device capable of communicating via a Wireless Wide Area Network (WWAN) and via the WLAN is within a range of the WLAN base station. The computer implemented method includes sending a registration message including an Internet Protocol (IP) address from the WLAN base station to the mobile phone device. The mobile device sends a call forwarding message from the mobile phone device to a network element of the WWAN after receiving the registration message. The call forwarding message redirects a call destined for the mobile phone device to the WLAN base station for transmission to the mobile phone device. The computer implemented method includes receiving the redirected call from the WWAN. The computer implemented method includes sending the redirected call to the mobile phone device when the mobile phone device is within the range of the WLAN base station, but not sending the redirected call from the WLAN to the mobile phone device when the mobile phone device is outside the range of the WLAN base station.