PURPOSE:To determine a communication line number from an inputted communication terminal address, by storing the address of data transmitter/receiver to be verified and collating it with the address of a data transmitter and receiver under informing of communication request. CONSTITUTION:An address storage area AB is stored with an address of a communication terminal inputted from a maintenance personnel, and the information on a line L is inputted to a protocol veification device C. The information from the line L is transferred to a packet analyzing circuit PA, via an AND circuit A2, the circuit PA discriminates the types of packet from this information, and when the packet is an outgoing or an incoming packet, this is given to an address collation circuit AC. When the circuit AC collates an area AB and an address of the circuit PA, and when they are coincident, a logical channel LGCH number from the circuit PA is sent to a channel checking circuit LA, and the information from the circuit PA is sent to a protocol verification circuit PC. The circuit LA checks the LGCH number from an AND circuit A1, and when the number is coincident with the number from the circuit AC, the results are sent to the circuit PA. The circuit PA analyzes the types of packet of all the received information and the results are sent to the circuit PC.
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