| Summary: | 碩士 === 國立成功大學 === 工程科學系碩博士班 === 92 === SIP (Session Initiation Protocol) [5,6,7] is a communication protocol which is used in development multimedia communication applications, especially for VoIP applications and media conference systems. Although SIP is been broadly deployed recently, the communication behind NAT management is still a problem. It causes media data transfer failed. Some methods for solving this problems were proposed. Those are relaying all media packets, modifying NAT machine or adding some new communication protocols or components.
The main purpose of this thesis is to solve the voice communication problems which caused by NAT management in a hierarchical SIP communication environment. A method which only use SIP standard messages is proposed to solve the problem. The proposed method is different from that of STUN[8,9,10], UPnP[12] , ALG or modifying NAT machines.
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