In-call handoff between cellular and packet switched networks

摘要

A telecommunications device is operable to perform in-call handoff between a cellular network and a packet-switched network. The telecommunications device includes interfaces connecting the telecommunications device with a circuit-switched network and a packet-switched network. The telecommunications device is operable to receive a request from a multi-mode device to handoff an existing call over a cellular network to the packet-switched network. The existing call is between the multi-mode device and a remote party and was established without the telecommunications device. In response to receiving the request, the telecommunications device establishes a first call leg in the packet-switched network with the multi-mode device. The multi-mode device sends a transfer signal to a call server in the cellular network requesting the transfer of the on-going voice session from itself to the telecommunication device. A second call leg is setup between the telecommunication device and a remote party. The telecommunication device helps to bridge the first call and second call leg, and then the multi-mode device can continue the voice session in packet switched network.

主权项

1. A telecommunications device operable to perform in-call handoff between cellular and packet-switched networks, the telecommunications device comprising:
a circuit-switched interface connecting the telecommunications device with a circuit-switched network; a packet-switched network interface connecting the telecommunications device with a packet-switched network; and a processor receiving a request from a multi-mode device to transfer an existing call that was made by the multi-mode device over a cellular network to a remote party using a cellular interface of the multi-mode device to a call that is between the multimode device and the remote party over the packet switched network using a packet interface of the multi-mode device, wherein the existing call was established in the cellular network without using the telecommunications device, and wherein the request is sent using a public service identity of the telecommunications device; in response to receiving the request, the processor establishes a first call leg in the packet-switched network between the telecommunications device and the multi-mode device via the packet-switched interface, establishes a second call leg between the telecommunications device and the remote party via the circuit-switched interface; and transfers the call from the cellular network to the telecommunications device such that the call between the multi-mode device and the remote party uses the first and second call legs.