摘要 |
System and method for IP telephony. The system includes at least one IP telephone (IPT), a Service Gateway (SG), and a Media Gateway Controller (MGC ). After the IPT is activated, the SG performs client DHCP lease negotiation wi th the IPT, using an identifier of the IPT to assign a range of ports to the IP T, and providing DHCP lease information, which is stored on the SG and the IPT. Operational software is downloaded from a TFTP server and executed by the IP T for initialization. The MGC registers the IPT, which then performs IP communications using one or more ports in the range of assigned ports, where the SG receives packets, performs NAPPT on source/destination IP addresses i n the packet header for outgoing/incoming calls, while leaving port informatio n unchanged, and sends the packets on to their destination, where the IPT is uniquely identified using a public IP address and port number.
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