System of soft exchange network passing through firewall based on ALG+MP and its method

Abstract

This invention discloses a system and a method for passing through fire walls based on the ALG+MP soft exchange network composed of an ALG1, MP2, LAN exchanger3, FW4, MGC5, IAD6, an ordinary phone set 7 and SPY 8, in which, the ordinary phone set is accessed into LAN exchanger3 then to IP by IAD6 to call controlled by MGC5 and matches with MGC5 to finish the penetration of FW4 by ALG1 and MP2, ALG1 sets up the communication connection between terminals and MP2 to realize communication among terminals by the forward of medium flows of MP2.

Description

technical field [0001] The invention relates to a method for a softswitch network to pass through a firewall in the field of network communication, in particular to an application layer gateway (ALG) program and a media proxy server (MP) program. Background technique [0002] Network Address Translation (NAT) is a standard method for mapping one address domain, such as a corporate intranet, to another address domain, such as the Internet; it allows hosts in a private network to use private addresses to connect to the public domain It can relieve the exhaustion of 32-bit long IPv4 (referring to the network based on the fourth version of IP) address resource. On the other hand, in order to improve network security, most enterprises deploy a firewall (Firewall, FW for short) at the egress. Most applications integrate the address translation function and firewall on one device to ensure the security of the private network, provide security policies, and prevent external attacks...

AI Technical Summary

Problems solved by technology

The untranslated private network address cannot be routed on the public network, so communication cannot be established

Therefore, it is very difficult for enterprise users and broadband users who access the public network through such firewall devices that do not support the softswitch protocol to actually carry out business.

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