| 摘要 |
PURPOSE: A method for servicing a subscriber group of an IP(Internet Protocol) telephony system is provided to assign an identical phone system and maintenance system to IP terminals and legacy terminals to be integrated into one system, so as to provide various group services even to the IP terminals. CONSTITUTION: A call processing module searches whether a general directory number of an extension group is selected(302). If so, the call processing module seizes the extension group(304), and receives a seizure response message from an incoming call processor for the general directory number of the extension group(306). An originating call processor of the call processing module searches whether the other party has an IP terminal(308). If so, the call processing module provides a ring back tone to an originating IP terminal(310). If the other party has a legacy terminal in the step 308, the call processing module generates a gateway seizure request signal to seize a channel(312). If a seizure request response is received from the gateway, the call processing module transmits a gateway channel seizure response message to an incoming call processor of the legacy terminal to provide a ring to the other party(314). And the call processing module provides a ring back tone to the originating IP terminal(316).
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