Patent ID: 8447303

Claim:
A method of switching a voice communication at a wireless device from a first type of communication network to a second type of communication network, the wireless device being associated with a telephone extension of an enterprise communication network and communicating with a second device, said method comprising: maintaining a first call leg to the wireless device and a second call leg to the second device, the first call leg being established with the first type of communication network; receiving information indicating that it is possible to switch the voice communication at the wireless device to the second type of communication network; prior to making a determination of whether to switch the voice communication at the wireless device to the second type of communication network: initiating a third call leg to the wireless device using the second type of communication network; and bridging the first, second and third call legs together using a muted bridge connection whereby no speech path is initially available over the third call leg; determining whether to switch the voice communication at the wireless device to the second type of communication network; and if it is determined to switch the voice communication at the wireless device to the second type of communication network, dropping the first call leg and making the speech path over the third call leg available; otherwise dropping the third call leg without having made the speech path over the third call leg available.