Factors to be considered when deploying VoIP infrastructure across an organization to help eliminate the most common VoIP security threats, such as the distributed denial-of-service (DDoS) attack, spams and frauds.
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What would be consider for VOIP price | ArticlesBase.com
Insist on the vendor testing your network to be sure that it has the capability to handle and support the telephone traffic that will be produced by adding a VoIP system.