COMMUNICATION SYSTEM AND COMMUNICATION TERMINAL AND COMMUNICATION NETWORK USED BY THIS COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a communication system that can simply and surely select a communication service class convenient for both a caller side and a called party. SOLUTION: A control section 21 of a communication terminal 2 receives designation by a caller user of an object service at call transmission and transmits notice information denoting its object service to a communication network 1. The communication network 1 transfers this notice information to a communication terminal 2 being a destination. The control section 21 receives the designation by a called user of the permissible service among the object services denoted by the notice information transferred from the communication network 1 and transmits the reply information denoting the permissible service to the communication network 1. The communication network 1 transfers the reply information to the caller communication terminal 2. The control section 21 selects the use service from the permissible information denoted in the reply information transferred from the communication network 1 at the call transmission and makes a call to conduct communication for the use service.