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Published on 17 Feb 2011 | over 5 years ago

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Level: Beginner
Presenter: Eli the Computer Guy
Date Created: August 8, 2010
Length of Class: 60 Minutes

Telephone Systems

Introduction to Telephone Systems
Introduction to Convergence
Purpose of Class

This class discusses the basic components and requirements for a business or enterprise Voice Over IP telephone system.
Topics Covered

VoIP Servers
VoIP Clients
Network Latency
Unified Communications
Class Notes

VoIP Servers
VoIP Servers route calls like a traditional PBX
There are proprietary and Open Source versions of VoIP Server software
VoIP Clients
VoIP "phones" are all client computers
Hard Phones are computers made to look like traditional phones
Soft Phones are software that is installed on a computer so that the computer can be used as a phone
Gateways connect VoIP networks to the PSTN (Public Switched Telephone Network)
VoIP Systems use protocols for servers and clients to communicate
SIP is a standards based protocol that numerous vendors use
Codecs are used to encode voice communication
Codecs determine the Sound Quality and the Bandwidth usage of a call
Most VoIP servers come with codecs that you can use without any extra fees. If you need better codecs they can be purchased
Network Latency and QOS
Network latency is the time it takes for data to get from point A to point B
Standard telephones have a latency of 45ms, VoIP can have a latency of up to 75-100ms.
QOS -- Quality Of Service -- is a feature of networking equipment that allows the equipment to prioritize network traffic based on what it is.
Unified Communications is the idea that computer programs and server should be able to work with telephone communications.

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