Handoff system and method between different kinds of devices, SIP server and operational method of SIP server

A handoff method between different kinds of devices in a handoff system which performs a handoff from a source device to a target device among a plurality of devices, the method comprising:

• if a handoff request signal is input from the source device, updating a predetermined routing path;
• getting the target device to participate in a current session;
• and
• transmitting data to the source device and the target device via the updated routing path.

A Session Initiation Protocol (SIP) server used in a handoff system which performs a handoff between a source device and a target device among a plurality of different kinds of devices, the SIP server comprising:

• a device interface which receives a handoff request signal from the source device;
• a gateway interface which transmits a request signal for a routing path update;
• and
• a controller, which controls the gateway interface to transmit a request signal for the routing path update when the handoff request signal is received through the device interface, and gets the target device to participate in a current session.

An operational method of a Session Initiation Protocol (SIP) server used in a handoff system which performs a handoff between a source device and a target device among a plurality of different kinds of devices, the method comprising:

• receiving a handoff request signal from the source device;
• transmitting an update request signal for a predetermined routing path;
• and
• getting the target device to participate in a current session.