VoIP

From POTS to Packets (VOIP)

VoIP technology enables traditional telephony services to operate over computer networks using packet-switched protocols. Packet-switched VoIPputs voice signals into packets, similar to an electronic envelope. Along with the voice signals, the VoIP packet includes both the caller’s and the receiver’s network addresses. VoIP packets can traverse any VoIP-compatible network. Because VoIP uses packets, much more […]

Gaining Flexibility with VoIP

VoIP is not just about making and receiving telephone calls; it’s about a whole new way of communicating. Sure, it includes telephone calls, but there is so much more to the VoIP telephony picture. VoIP integrates most if not all other forms of communication. You can even run videoconferencing to your desktop. With VoIP, your […]

Looking at the TCP/IP Model (VOIP)

Many people marvel at the very thought that the POTS method of placing telephone calls can be replaced by a technology that essentially runs on the computer network. They are also startled by the many new and exciting features that come with VoIP. However, people also question how VoIP can possibly work and are a […]

Not Your Father's Telephone Service (VOIP)

VoIP: In This Topic ^ Uncovering the origins of VoIP ^ Telephoning using analog lines ^ Going digital ^ Networking analog and digital ^ Digitizing the public telephone network ^ Raging war between circuits and packets ^ Replacing POTS phone systems with VoIP ^ Discovering how private telephone systems reduce POTS costs ^ Watching network […]

Mr. Bell (VOIP)

Believe it or not, the roots of VoIP go all the way back to the 1870s. In 1879, Alexander Graham Bell forgot his Internet password and, knowing that his assistant had stashed it away, uttered the famous words “Watson! Are you there?” He never got on the Internet, but he did prove that the human […]

Telephony Goes Digital (VOIP)

Scientists, never content with two tin cans and a string, looked for different ways to transmit sounds over long distances. The pioneering work of Harry Nyquist in the 1920s gave us the basics of sampling theorem. In the 1940s, Claude Shannon would mathematically prove Nyquist’s sampling theorem. Their work is the foundation for what we […]

Analog Telephone Circuits (VOIP)

As mentioned, phone technology originally was analog, from start to finish. Analog modulation is the technique used to convert sounds (such as your voice) into an electromagnetic form. The analog circuitry of the POTS telephone transmitter converts the voice patterns coming from the caller’s mouth into continuous electromagnetic signal patterns. These patterns are carried on […]

Combining Analog and Digital (VOIP)

When digital networks were introduced, the phone companies wanted to use them right away because they provided a more efficient means of transmitting signals all over the place. (Digital networks could carry data much faster than analog networks.) The phone companies were presented with a problem, however: how to make existing analog phones work with […]

Digital Telephony Invades PSTN Territory (VOIP)

When digital networks were implemented back in the 1960s, the telephone carrier companies began using a technique that permitted them to accept analog telephone calls coming into their switching facilities and convert those signals into digital form for transmission on their shiny new networks. They had not yet made the leap into packetizing telephone calls, […]

War Breaks Out Between Circuits and Packets (VOIP)

The corporate sector’s thirst for leasing dedicated DS lines was unquenchable. Soon a dilemma emerged as to how to distinguish the circuit-switched network and the newer dedicated network, which used packet-switching technology. Since its inception, the circuit-switched network was a public carrier services network. The DS network was being called dedicated, or private, because no […]

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