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Power-Supply Infrastructure
Often overlooked as part of the infrastructure required for secure VoIP is how power issues will be addressed. PBX and PSTN phones run on a common battery system that provides availability for free in the face of a power outage, but VoIP phones and the infrastructure that powers them must be carefully designed to […]

IP Switches and Routers
Although their position is defined by a standard data network rather than VoIP, a router’s purpose in life is to connect two or more IP subnetworks at layer 3.An IP switch performs a similar function at layer 2. Routers and switches operate on the network and data-link layers, respectively, investigating the IP […]

Endpoints (User Agents)
In a phone system, an endpoint on the network was known as a terminal, reflecting the fact that it was a slave to the switch or call-control server. But today’s endpoints may possess much more intelligence, thus in the SIP world the term User Agent is preferred. This could be a hardware IP […]