As voice over IP (VoIP) technology in the global telecom market expansion, the service providers, equipment manufacturers and end users in terms of performance improvement, cost reduction and function support VoIP has become a very attractive things, because of the growing interest in VoIP voice communication security is likely to become a VoIP solution a key demand of communication based on grouping of security risks are especially vulnerable, these risks include: packet voice "hacking" monitoring, forge the network ID not paid services such as use and manipulation of the packet service interruptions caused by, although already contains security features VoIP implementation is one of the few, but we now have several standard into consideration scope,
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