Patent ID: 8134955

Claim:
A method of performing a handover, the method comprising: an Internet protocol (IP) multimedia subsystem (IMS) client registering with an IMS network; the IMS client establishing a media independent handover (MIH) session with an MIH application server using a session initiation protocol (SIP) by sending an INVITE request from the IMS client to a proxy call session control function (P-CSCF), the INVITE request including a string “MIH services” and a unique identifier of an IMS client; the IMS client establishing a session for IP-based service with a communication peer using an SIP; the IMS client exchanging an MIH message for a handover with the MIH application server over an IP; the IMS client performing a handover; the IMS client sending a RE-INVITE request or a REFER request to resume the session for IP-based service, the RE-INVITE request and the REFER request including a string “MIH services” and the unique identifier of the IMS client; and the IMS client resuming the session for IP-based service.