Patent ID: 7346022

Claim:
A method comprising: at a gatekeeper of a first domain, the gatekeeper associated with a location database, the location database comprising home user location information and visiting user location information: receiving, from a calling H.323 entity registered with the gatekeeper and located in the first domain, a message comprising an alias address of a called H.323 entity, the message originating a call to the called H.323 entity, the called H.323 entity registered as a home entity in a second domain, the called H.323 entity registered as a visitor in a third domain; receiving a called routable alias address for the called H.323 entity, the called routable alias address associated with the alias address of the called H.323 entity, the called routable alias address received from a non-gatekeeper database external to the fist domain, the second domain, and the third domain; and sending the called routable alias address to the calling H.323 entity.