Patent ID: 7933982

Claim:
An apparatus for providing inter-domain presence services in presence service systems including different domains, said apparatus comprising: a presence server in each of a local domain and a foreign domain, said presence server having an enhanced inter-domain presence (EIP) module, said EIP module in said local domain maintaining and updating a foreign domain document (FDD) by aggregating all foreign-domain presentities in said foreign domain subscribed by all watchers in said local domain; and a list server in each of said local domain and said foreign domain, said list server having an enhanced inter-domain presence authorization document (EIPAD) module, said EIPAD module in said foreign domain identifying actual presentities subscribed in said foreign domain based on said FDD and notifying said presence server in said foreign domain of said all foreign-domain presentities; wherein said presence server in said local domain requests said presence server in said foreign domain for a domain-based list subscription to presence status according to said FDD, said presence server in said foreign domain obtains said all foreign-domain presentities subscribed by said all watchers in said local domain from said list server in said foreign domain, composes aggregated presence information of said all foreign-domain presentities and notifies said presence server in said local domain of said aggregated presence information in a single notification message, and said presence server in said local domain sends subscribed presence information in said aggregated presence information to respective watchers in said local domain.