Patent ID: RE43789

Claim:
An SIP (Session Initiation protocol)-based user mobility service providing apparatus that is connected to an SIP-based IP multimedia service network in an environment where various communication infrastructures coexist and transmits an SIP message to an SIP terminal and an SIP proxy server through a gateway to provide a mobile user with an SIP service, comprising: a sensing part that detects an event that the user enters a specific region or goes out of the specific region based on signals from at least one marker, to obtain a position of the user; and a sensing management module that receives information on the position of the user in the specific region from the sensing part and carries out SIP registration for terminals in the specific region when it is confirmed that the user, enters the specific region and carries out SIP cancellation of SIP registration for terminals in the specific region when it is confirmed that the user goes out of the specific region.