, according to the ministry of information industry by August 2005, VoIP domestic long duration of more than 85 billion minutes, is close to the fixed telephone and mobile phone, the sum of all the domestic long distance calls but now commercial VoIP technology is not mature, still in rapid development and change, such as a distributed VoIP implementations, faced with how to through the network address translation/firewall equipment and all kinds of security threats and challenges, such as VoIP industry has formed a VoIP security alliance, VoIPSA is mainly responsible for the dynamic, VoIP is a aims to raise public awareness of VoIP security and privacy issues the openness of organization,
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