The security of VoIP networks can be divided into three categories: the security of the signal transmission, the security of the voice transmission, VoIP network yuan endpoint (such as server, gateway, the client calls, etc.), safety of signalling safety should be a VoIP security should pay attention to the primary question, VoIP network signaling usually include call setup, call control, access to a specific business and function and the limitation of user privileges, signaling encryption to protect the server and the client at the same time, the VoIP network signaling system is extremely important to encrypt, main is to guarantee the VoIP service providers network not be attacked and hijacked,
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