| 摘要 |
A protocol interworking device communicates with at least one first network telephone terminal supporting a first protocol and at least one second network telephone terminal supporting a second protocol. The protocol interworking device includes a protocol converter supporting both the first and second protocols, and a transferring telephone enabled to communicate with both the first and second network telephone terminals by the protocol converter. When the first network telephone terminal sends a call request for calling the second network telephone terminal to the protocol interworking device, the transferring telephone hangs up with the first network telephone terminal and sends another call request to call the second network telephone terminal. When successfully connecting to the second network telephone terminal, the transferring telephone reconnects with the first network telephone terminal, and the first and network telephone terminals communicate with each other through the protocol interworking device.
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