The Research and Implementation on NAT Traversal and SIP

• Main Authors: Chien-Yu Chung, 鍾建宇
• Other Authors: 黃紹華
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/8ar737

碩士 === 國立臺北科技大學 === 電機工程系所 === 95 === In this thesis, the advance method is proposed to improve the drawback of SIP protocol. Moreover, this advance method and SIP are implemented into the embedded product. In the real network, due to the lack of IP address in IPv4 mode and the security/firewall issue, more than 75% users are located under virtual IP address. If any one of two communicated parties locates under virtual IP, the SIP protocol will fail. In the past, many solutions were proposed to improve this drawback. However, the drawback is still existed. In this thesis, the NAT traversal method--NTIP is firstly proposed to improve the SIP protocol. More than 99% virtual IP are successfully employed with direct peer-to-peer(DP2P) mode. The performance of NTIP and DP2P mode are superior to the STUN of IETF in the experimental results. Moreover, the SIP protocol and NTIP method are implemented in the embedded VoIP gateway. The OS of this gateway is MicroC/OS-II. The performance and cost of this gateway are well enough for market.