REMOTE PRIVATE BRANCH EXCHANGE FOR IP PHONE SERVICE AND GROUP CUSTOMER CALL SERVICE METHOD USING THE SAME

摘要

PURPOSE: A remote private branch exchange for an IP(Internet Protocol) phone service and a group customer call service method using the same are provided to configure a call agent and a centrex to be separated logically, so as to implement a group customer service without an additional function in subscriber terminals. CONSTITUTION: A call agent(120) includes authentication(121), call control/routing(122) and an H.323 protocol stack(123). The authentication(121) authenticates and permits a subject requesting a call. The call control(122) performs call setup using the H.323 protocol stack(123). The routing(122) analyzes information on the call to decide whether the call is for group customers. If so, the routing(122) requests call setup to an IP-centrex(130) to connect the call with an incoming party, and if the call is an external call not for the group customer, the routing(122) performs call setup directly to the incoming party. When the call setup is requested to the IP-centrex(130), a centralized call processing module(131) confirms corresponding group customers by referring to group customer database(132), and performs call setup using an H.323 protocol stack(133).