CONNECTION METHOD FOR VIRTUAL NETWORK AND GATEWAY EXCHANGE

PROBLEM TO BE SOLVED: To realize a connection method connected by means of the function of a gateway exchange without revising a numbering plan in the case of connecting prescribed business offices in plural private networks by a virtual network connected by the gateway exchanges as of the connection method and the gateway exchanges in the virtual network where the prescribed business offices in the plural private networks are connected by the gateway exchanges. SOLUTION: This gateway exchange discriminates whether or not an enterprise, an office and an extension number of a caller are registered in a virtual network from an incoming trunk identification number and a caller number of a call (STEP1), discriminates whether or not the connection to an incoming call number is allowed to correspond to the enterprise, the office and the extension number of the caller (STEP2), converts the incoming call number into an incoming call number in a private network by referencing a database when the connection to the incoming call number is allowed (STEP3) and acquires an outgoing trunk and sends the incoming call number thereto (STEP4).