Patent ID: 8588174
Filing Date: 2013-11-19
Classification: H04L,H04W

Abstract:
1. A method of handing over an active call between a dual-mode device and a remote device, wherein the dual-mode device includes a Voice-over-Internet Protocol (VoIP) interface for wireless communications over an IP network and a cellular interface for wireless communications over a public land mobile network (PLMN), wherein the IP network includes a communications server, and wherein the active call is a VoIP call using the VoIP interface of the dual-mode device, the method comprising the steps of: managing the handing over by placing the active call on hold; the dual-mode device establishing a second call from the VoIP interface to the cellular interface of the dual-mode device via the communications server and the PLMN, wherein the second call includes a VoIP leg from the VoIP interface of the dual-mode device to the communications server; the dual-mode device instructing the remote device to initiate a new call to the communications server referencing the second call and causing the communications server to replace the VoIP leg of the second call with the new call, thereby joining the remote party to the second call connected to the cellular interface of the dual-mode device; and terminating the active call.