Patent ID: 8554220

Claim:
A mobile terminal comprising: a transmission unit configured to transmit a request message for handover information to a network device; and a receiving unit configured to receive a response message including the handover information from the network device, wherein: the request message and the response message are transceived by an application layer protocol, the application layer protocol corresponds to a Session Initiation Protocol (SIP), the transmission unit transmits the request message using an SIP SUBSCRIBE request or an SIP PUBLISH request, the request message includes the handover information, if the transmission unit transmits the request message using the SIP SUBSCRIBE request, the SIP provides an SIP event service, if the transmission unit transmits the request message using the SIP PUBLISH request, the SIP provides an SIP presence service, and the handover information includes at least one of a network type, an operator name, and a roaming agreement.