Internetwork communication system for managing subscriber switches

Abstract

A communication system in which a subscriber terminal moves between networks having different number plans. The moved subscriber terminal can receive the same service as that of the network from which the subscriber terminal has moved (movement originator network) without being conscious of the movement. In the system, when the subscriber terminal moves between the networks having the different number plans, the movement of the subscriber terminal is registered in the network to which the subscriber terminal has moved (movement destination network), data is exchanged with the movement originator network, an allocated number correlative table is prepared and stored in the movement destination network; while, a movement destination number correlative table is prepared and stored in the movement originator network. When the moved subscriber terminal issues a call to another network, call control is transferred from the movement destination network to the movement originator network on the basis of the allocated number correlative table and carried out in the movement originator network on the basis of the movement destination correlative table.