To establish a security of VoIP network, the first step is to its independence from your data in the network, although all the network integration together, may be in the management of simplicity and work together more ideal, but it is not safe, the best choice is to use a VLAN switch data and voice network logically separate, this means that the data will not affect the network attacks your VoIP system, for an IP network, border protection usually means using a firewall, but an old firewall is not suitable for VoIP network, you need a special design of the firewall, it can identify and analysis of VoIP protocol, deep inspections for VoIP packets, and analysis of VoIP payload to find any clues related to the attack,
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