MANAGING PRESENCE SERVICE INFORMATION IN COMMUNICATIONS SYSTEM

摘要

In the invention, a first user terminal (UE1) maintains contacts information on a second user terminal (UE2), and a contacts server (XDMS) maintains contacts information on user terminals (UE2) that are capable of using a presence service and that allow provision of their presence information to the first user terminal (UE1). The contacts information stored in the contacts server (XDMS) is compared (2-2) with the contacts information stored in the first user terminal (UE1). If the contacts information stored in the contacts server (XDMS) in- cludes contacts information on the second user terminal (UE2), the first user terminal (UE1) is notified of this, wherein the contacts information in the first user terminal (UE1) and the contacts information in the contacts server (XDMS) can be synchronized to each other.