| 摘要 |
A communication system for communication between a plurality of networks through a NAPT (Network Address Port Translation) device has communication terminals provided in a local network and a global network, a main device for managing communication information of the communication terminals, and a table provided in the main device for storing identification information, a local address, and a global address of each communication terminal in association with each other. When a communication terminal originates a call, the table is referred to, and when the destination of the call is a communication terminal outside the network, the global address of the NAPT device of the remote network is used as the mutual destination address, whereas when the destination of the call is a communication terminal present in the same network, the local address effective only in the local network is used.
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