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Securing VoIP Networks
Description
VoIP does not come in one flavor, and unfortunately there are several perceptions of what is VoIP. For example, IP telephony and VoIP do not mean that Internet connectivity is involved. Internet telephony, on the other hand, means that the IP connectivity is established through the Internet, with or without encryption services such as Virtual Private Networks (VPNs) or IPSec to protect the communications. The first way to implement enterprise VoIP is probably through private dedicated lines or VPN connections between different sites, as opposed to using the public Internet to route the calls. Enterprises do this because (at least partially) of the risks involved with the “hostile” Internet. In these types on deployments, the VoIP infrastructure is built and maintained by the enterprise or bought as a hosted service, and there is necessarily no connection to the Internet or PSTN.
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