Due to h. 323 technology of signaling and media flow section respectively, based on the TCP and UDP, attack packets are likely to exist in the network layer, transport layer and application layer, it needs to support VOIP in h. 323 anti attack detection of firewall can work on the network layer, transport layer and application layer, to complete the message parsing, due to some DOS/DDOS attack run in the network layer/transport layer, and firewall syn cookies, syn - proxy technology can solve the syn flood - such a DOS attack, other attack prevention technique can effectively prevent the icmp - flood, land - attack, teardrop attack, attack, due to the h. 323 is the use of IP forwarding, some VPN technology, such as Ipsec, etc., to a certain extent, can solve the problem of a safe,
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