Apparatus and method of pstn based network roaming and scp based subscriber management for internet telephony systems

Abstract

A system and method of PSTN based network roaming and SCP based subscriber management for internet telephony systems. When a call is incoming to the central office of a subscriber's home service area which supports packet data network telephony , such as for instance IP telephony, a home location register translates the directory number into an IP address, URL address, or electronic mail address much the same that a local number portability node re-routes calls for non-IP telephony systems. When a subscriber is roaming in another network , the roamed into (visited) gateway signals back to the home location register of the subscriber's network and registers its (i.e., the visited gateway's) public switching telephone network telephone directory number and the IP address assigned to the subscriber while connected to the visited network . When subsequent calls are incoming to the subscriber's home network switch, the home location register provides the ten (10) digit directory number of the visited gateway and the new IP address rather than the home gateway telephone number and IP address of the subscriber.