Method for implementing multimedia service NAT transition

Abstract

The invention provides a method for implementing NAT penetration of multimedia service, presetting a public network address IP1 and two private network addresses IP2 and IP3 for agent device, where IP2 and IP3 are configured at the network interface of the agent device, private network terminal configuration system controls device address to be IP2, the agent device communicates with private network terminal through IP2, IP3 is used to communicate with system control device and external terminal (public network terminal) through NAT device; IP1 is configured on the NAT device and makes static NAT conversion with IP3; in data configuration mode, informing the agent device of IP1 of its data packet after NAT conversion. And the invention converts IP address of multimedia service signaling layer and IP address in IP packet head by the agent device and NAT device, respectively, able to implement rapid and high- efficiency NAT penetration of multimedia service and making networking cost lower.

Description

technical field [0001] The present invention relates to NAT (Network Address Translation, network address translation) traversal in the communication field, in particular to NAT traversal for multimedia services. Background technique [0002] With the widespread use of multimedia services on the IP network, one or more proxy devices that support NAT traversal for multimedia services are required to achieve intercommunication between users in the NAT device and users outside the NAT device and users under this NAT or other NATs. To realize the conversion of the IP address in the signaling and media packets in the communication, so as to achieve the purpose of intercommunication. [0003] like figure 1 As shown, the proxy device is usually set in three locations, namely, the inside of the private network (the location shown in "Proxy 1"), the edge of the public and private network (the location shown in "Proxy 2"), and the public network ("Proxy 3" location shown). [0004]...

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Problems solved by technology

[0005] The above prior art solutions have the following problems and inconveniences in practical application, which makes the actual networking application very difficult:

[0006] ①The public network address of the NAT device and the public network address of its transparent proxy device need to be in different network segments, which is difficult to apply for in actual application enterprises, and requires relatively expensive fees;

[0007] ②If the public network address of the NAT device and the public network address of the transparent proxy device are in the same network segment, at least 3 IP addresses and network segment divisions are required, which will cause a lot of waste of IP addresses, troublesome configuration, and poor operability;

[0008] ③ Within several levels of private networks, several PROXY (proxy) devices are required, which are placed in each level of private network respectively. The proxy device of the upper level of private network acts as a proxy for the media and signaling packets of the proxy device of the next level of private network. The proxy device of the first-level private network is configured with a public IP; this configuration method is not suitable for multi-level private networks, and the cost is very high

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