Analysts predict that by 2009, IP PBX will account for more than 90% of market share, however, before the deployment of VoIP, users need to know about security risks and the countermeasures should be taken, it is very important to safety in all cases, however, when the user to replace the oldest in the world, the biggest, the most flexible and most of the available communication networks, security is especially important, despite the lack of a safety measures for VoIP deployment can completely eliminate the attack, but a way of multi-level, can effectively reduce the possibility of a successful attack,
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