可授權專利


SIP通訊協定之NAT穿越法 


專利名稱 SIP通訊協定之NAT穿越法
專利國家
   專利證書號
美國 US 8,676,933 B2
專利權人 國立台北科技大學
發明人 黃紹華、陳冠霖、張舜傑、黃啟榮、沈立得、劉邦辰
應用領域
需求項目









技術摘要


The present invention provides an NAT (Network Address Translator) traversal method in Session Initiation Protocol (SIP) for solving the problems of SIP in Internet phone (VoIP) under current Internet environment. In other words, the present invention solves the SIP problems caused by NAT (Network Address Translator) that P2P (Peer to Peer) transmission cannot traverse the NAT firewall directly. The major content of the present invention is that the computer conducts multiple registrations before issuing an Invite message in order to detect the rule of the NAT server to assign port number and IP address. Additional commands or parameters beyond the SIP standard are not required for the NAT traversal function. Hence, the capability of SIP for a NAT traversal function is provided without no additional commands or parameters.


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