Patent ID: 7864766

Claim:
A directory number mobility method comprising: receiving, into a first cluster of a multiple cluster telecommunication network, identification data corresponding to an identity of an associated user having a directory number previously registered within the multiple cluster telecommunication network; registering the directory number and an associated first telecommunication device corresponding to the user with a first call control agent of the first cluster in accordance with received identification data; communicating registration data corresponding to the directory number being registered with the first call control agent of the first cluster to at least a second cluster of the telecommunications network; routing an incoming connection request associated with the registered directory number received by the multiple cluster telecommunication network directly to the first telecommunication device in accordance with the registration data; deregistering the directory number and associated first telecommunication device corresponding to the user with the first call control agent of the first cluster in accordance with received session termination data, wherein the session termination data corresponds to a time expiration signal or logout information received from the associated user; communicating deregistration data corresponding to the deregistered directory number to the at least a second cluster of the telecommunications network; and routing an incoming connection request associated with the deregistered directory number to a default telecommunication device of the associated user in accordance with default registration data.