Popular now IP network model to network communication process into different levels, this let a person more easy to understand, deployment and debugging, whether it is set by the international standards organization 7 layer model, or the department of defense 4 layer model of development, can make people better understand the operation of each level protocol, it is necessary for all IP encryption, to protect your VoIP network, the best way is to adopt a multi-layered security mechanism, on the potential invaders attack route manufacturing all kinds of obstacles, as much as possible from the separate voice and data networks, VoIP with special firewall, protect the VoIP gateways, locking network physical layer, network layer using IPSec encryption is introduced in aspects of the protection of VoIP,
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