本文介紹利用MIDCOM協議，將程序智能從NAT/FW轉移到第三方，從而解決在SIP網的
大規模部署中，NAT/FW性能成為整個SIP網的瓶頸這一難題。基于MIDCOM協議構架的SIP穿越NAT/ FW 解決方案在組網方面具有很強的擴展性,一旦NAT/ FW設備支持MIDCOM 協議,通過MIDCOM 代理對SIP 應用協議作相應的處理,便可一勞永逸的解決SIP 業務的NAT/ FW 穿越問題。
關鍵詞：中間盒通信、會話初始化協議、網絡地址轉換、防火墻

SIP traverse NAT/FW based on MIDCOM protocol KUANG zhi-rong，WANG fu-rong
Electronic and Information department, Huazhong University of Science and Technology, Wuhan 430074, china Abstract:In large scale SIP net, the performance of NAT/FW is the whole net’s bottleneck. This paper introduces a way using MIDCOM protocol, transferring application intelligence to the third party (MIDCOM agent) to solve this problem. When construct SIP network, this way has strong extensibility. While NAT/FW devices support MIDCOM protocol, it can solve the problem entirely through MIDCON agent extending SIP.
Key words: MIDCOM, SIP, NAT, firewall