Allworx 24X Manual de usuario descargar pdf (Pagina 5)

VoIP White Paper

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Revised: February 8, 2007

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2 What Does VoIP Really Mean Anyway?

The term VoIP is officially an acronym for Voice over Internet Protocol, but is also used to loosely refer to any

application where packet-based data networks are used to packet switch telephone calls in real-time. This type

of telephony contrasts to traditional hard-wired analog telephony that is circuit switched. Going to VoIP-based

telephony technology has several advantages, both technical and economic, but also introduces some new

complexities that must be managed as part of the data network.

Traditionally, data networks and the Internet in general were developed only as a best-effort service. The

network was designed to get the data there as fast as possible – and when there were problems, to get as

much data there as possible eventually. This is a good design characteristic for data, but it has problems with

true real-time constraints to support toll-quality telephone calls. For telephone audio, not only are bandwidth

and throughput important, but packet loss, latency, and jitter performance are also critical factors to good-

sounding audio. Therefore, real-time applications like VoIP gave rise to engineering and managing the Quality

of Service (QoS) of data networks.

Designing networks for QoS factors and diagnosing QoS problems are entirely new dimensions in data

networks for many people. In VoIP applications, a valid data connection is required to ensure application

success and a high-quality, maintainable QoS. It is not uncommon for data networks to have throughput or

packet loss problems that go completely unnoticed until VoIP systems are deployed. Thus, when deploying

VoIP systems, it is important to inspect or validate the existing network to make sure it is going to be VoIP-

ready from a QoS perspective. This is an especially important consideration when VoIP calls are going to be

placed over data connections between physical locations. QoS topics are further explored later in this

document, but the main items of interest are network packet latency, jitter, and packet loss rates.

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Allworx 24X Manual de usuario Pagina 5