VoIP three main security threat is: authentication failed, integrity failure and privacy, the implementation of VoIP, will consider on each network layer of the three threats, begin with the physical layer, to ensure that the building of a LAN with integrity, want to consider will there be a hacker infiltrated, launch a DoS attack? Use need not run on separate security network VoIP? Most VoIP devices do not support 802.1 x authentication standard, but it can be done media access security - although very trouble to do management, at the IP layer, such as DHCP and DNS services for VoIP network is vital, and takes into consideration the reliability and safety of them already? If the user needs access via the Internet (VoIP), also need the VPN tunnel,
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