本文介紹利用MIDCOM協(xié)議，將程序智能從NAT/FW轉(zhuǎn)移到第三方，從而解決在SIP網(wǎng)的
大規(guī)模部署中，NAT/FW性能成為整個(gè)SIP網(wǎng)的瓶頸這一難題?；贛IDCOM協(xié)議構(gòu)架的SIP穿越NAT/ FW 解決方案在組網(wǎng)方面具有很強(qiáng)的擴(kuò)展性,一旦NAT/ FW設(shè)備支持MIDCOM 協(xié)議,通過MIDCOM 代理對SIP 應(yīng)用協(xié)議作相應(yīng)的處理,便可一勞永逸的解決SIP 業(yè)務(wù)的NAT/ FW 穿越問題。
關(guān)鍵詞：中間盒通信、會話初始化協(xié)議、網(wǎng)絡(luò)地址轉(zhuǎn)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