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VoIP works with a company’s existing telephony architecture, including its private branch exchanges (PBXs)

Signaling Between the Telephone and PBX A telephone can be in one of two

The Need for Speed: Early warning signs for congestion problems Now, how can you tell

Super servers, high-capacity workstations, and multimedia applications have also fueled the need for higher

Three Types of VPNs Let’s look now at the three types of VPNs. Access,

The next slides graphically illustrate the migration from traditional circuit-switched voice networking to the