The digital call server can accomplished many fuction

eg authentication for user

authorization for user

account of user

encryption of information

agenting of network

receiving the requirement of customer

upbuilding disputation

connect control

business logic control. This paper also proposaled the conception and the whole configuration of digital platform of intelligent telephone system. According to the demanding of fuction

it is designed and accomplished the digital call server in digital platform of intelligent telephone system. Digital call connection server is the key point of the whole platform

digital platform of intelligent telephone system can provide abundant services only under the control of digital call connection server.