Handoff Method, Switching Device and Terminal

A switching device, applicable to implement a handoff if a first service link is established between a first terminal and a second terminal, the switching device comprising:

• a receiving unit adapted to receive a link establishment request from a first switching device, wherein the link establishment request carries address information of the first terminal and the second terminal;
• a link unit adapted to establish a link between the switching device and the first switching device according to the link establishment request received by the receiving unit;
• a checking unit adapted to check a connection relation table according to the address information of the first terminal and the second terminal in the link establishment request received by the receiving unit;
• and
• a handoff unit adapted to release a link between the switching device and the first terminal, and connect a link between the switching device and the second terminal with the link between the switching device and the first switching device established by the link unit, if the checking unit finds that the first service link is established between the first terminal and the second terminal.

A terminal, applicable to implement a handoff if a first service link is established between the terminal and a peer end, the terminal comprising:

• a receiving unit adapted to receive office direction information of a switching device on the first service link;
• a determining unit adapted to determine whether a handoff needs to be initiated;
• and
• a sending unit adapted to send a call request to a first switching device if the determining unit determines that the handoff needs to be initiated, wherein the call request carries the office direction information of the switching device on the first service link received by the receiving unit, and a called party indicated by the call request is the peer end.