| 摘要 |
<p>A communication system is provided in the present invention, which includes a program controlled exchanger (1) connected with a conventional program controlled telephone network (9), and also includes a first data exchange card (2), a second data exchange card (3),a VOIP server (4) and a network telephone terminal (5). The said first data exchange card (2) is electrically connected with the program controlled exchanger (1), the said second data exchange card (3) is electrically connected with the VOIP server (4), the said first data exchange card (2) is connected with the second data exchange: card (3) through the network, and the said VOIP server (4) is connected with the network telephone: terminal (5) through the network. The communication system of the present invention can realize the intercommunication between the conventional telephone and the network telephone. The user can be found at any place through calling the same extension telephone set number to talk, the communication is free, and it can save much cost for company. The system is simply maintained, easily extended and changed without the complex maintenance work caused by the person changed frequently.</p> |
