PURPOSE: To provide the digital communication network connection control system able to discriminate the correctness of a calling in a short time.

CONSTITUTION: The digital communication network connection control system is provided with plural call controllers 1, 3 interconnected by an INS network 5 and with a communication network management equipment 7 connecting to the call controllers 1, 3. The communication network management equipment 7 has a function of publicating a call command to the caller side call controller and a function of informing a caller number to the called party call controller. Moreover, the call controllers 1, 3 have a function collating caller number information included in a received called message from the INS network 5 with a caller number received from the communication network management equipment 7 to discriminate the correctness of the received cal. In this system, the correctness of the arrived call is discriminated, illegal connection between separate networks is prevented, the secrecy of the network is highly secured, the connection processing is simplified and the scale of the circuit of the call controller and the software are reduced.