可授權專利


改良式SIP通訊協定 IMPROVED SIP COMMUNICATION PROTOCOL 


專利名稱
專利國家
   專利證書號
美國 US8,700,785
專利權人 國立台北科技大學
發明人 黃紹華、姚秉志
應用領域
需求項目









技術摘要


The present invention provides an improved SIP communication protocol. An NAT (Network Address Translator) traversal method is added before the SIP communication protocol, i.e. a client to client (C2C) module function is added to improve the function of SIP communication protocol, so as to solve the problem that the RTP (Real-time Transport Protocol) packets cannot traverse NAT firewall to achieve C2C communication after SIP (Session Initiation Protocol) is ended in VoIP. The major content of the present invention is to conduct a plurality of detection before SIP communication protocol, so as to predict the allocation rules of the port number by the C2C module, and open the RTP channel for C2C.


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