Of all the security measures, multi-level approach works best, to protect your VoIP network, the best method is to adopt a multi-layered security mechanism, on the potential invaders attack route manufacturing all kinds of obstacles, as much as possible based on IP network and the public nature of the agreement, make VoIP is inherently possess the characteristics of relative to the traditional telephone network more vulnerable to attack, this paper introduces the by taking a careful planning, multi-level VoIP network protection measures, enterprises can make VoIP network safety degree to catch up with or even more than the traditional telephone systems,
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