METHOD FOR PROCESSING CALL CONNECTION BETWEEN 2ND GENERATION AND 3RD GENERATION MOBILE COMMUNICATION NETWORK

摘要

PURPOSE: A call connection process method between second and third generation communications networks for determining the subscription of a user of a receiving terminal by searching a subscriber identity module is provided to simplify a complex call process procedure for a number switching service of a voice receiving signal. CONSTITUTION: If a number switching processing request signal is received, a 2G(second generation) MSC(Mobile Switching Center) performs a routing operation for switching a telephone number. An FNRDB(Flexible Number Routing Database)(210) stores an MDN(Mobile Directory Number), an IMSI(International Mobile Station Identity), number switching, or a combination thereof. The terminal is subscribed to a 3rd generation communication network. An NPDB(Number Portability Database)(220) stores one of the subscriber telephone number about a number switched subscriber, a routing number, or a combination thereof.