Patent ID: 8238914

Claim:
A handoff method, wherein a first service link is established between a first terminal and a second terminal through a switching device, the method comprising: receiving, by a first switching device, a call request from the first terminal, wherein the call request carries office direction information of the switching device on the first service link, and a called party indicated by the call request is the second terminal; sending, by the first switching device, a link establishment request to the switching device on the first service link according to the call request, wherein the link establishment request carries address information of the first terminal and the second terminal; establishing, by the switching device on the first service link, a link between the switching device on the first service link and the first switching device according to the link establishment request; and releasing, by the switching device on the first service link, a link between the switching device on the first service link and the first terminal, and connecting a link between the switching device on the first service link and the second terminal with the link between the switching device on the first service link and the first switching device.