Voice over IP Online Course
Lesson 1 - Voice over IP Overview
Review: Voice over IP Overview
This module provides the basic introduction to voice over the IP protocol. Unless you know
how traditional analog telephone systems work and how data networks work, VoIP is hard to
Section A: What is VoIP?
This section defines VoIP as a hardware and software system that provides telephony services
over an Internet Protocol system.
Section B: Voice over the Internet
This section first looks at telephone services over the Internet. Both computer-to-computer
and computer to ITSP are examined. Since the quality of voice over the Internet is not up to
corporate standards, corporations are pursuing VoIP services over leased lines.
Section C: Corporate VoIP
Organizations see VoIP in three areas: toll bypass, replacing the corporate telephone system
with an IP based telephone system and pure IP end to end. This section examines these three
Section D: VoIP for Telephone companies and Service Providers
VoIP is a double edged sword for the telephone companies. It is a disruptive technology which
will require them to spend a lot of money to overhaul their systems and it will allow new
competitors to enter their business. On the other hand, they will be able to run their
systems in a more efficient manor. By deploying a superclass softswitch, their networks can
be made VoIP ready.
Exercise 1-1: Voip Overview
1. In order to relay a digital voice call from within a company to the public telephone
system, __________ is required.
a) A PBX
b) An H.323 gateway
c) A router
d) A firewall
2. Which one of the following reasons may prevent computer-to-computer telephone calls?
a) Each computer may have different telephony software
b) One of the computers may not have an IP telephone attached to it
c) Both of the computers have sound cards, microphones and speakers
d) One of the users hasn't set up an account with an ITSP yet
3. In order to achieve cost savings with toll bypass, a company needs ___________ .
a) An account with an ISP giving it access to the Internet
b) A PBX at both head office and the branch office
c) A special long distance plan
d) A leased line to its branch office which is located in a different area code
4. In order for a telephone to be connected directly to the local area network,
a) The PBX must have an IP interface
b) There must be a jack on the back of the computer to plug the telephone into
c) It must be an IP telephone
d) It can be an analog telephone with an IP address
5. In order for a VoIP telephone call to go from one data network to another, it must be
routed through ________ .
a) An H.323 gatekeeper
b) A digital PBX
c) A router
d) An H.323 gateway
[Top of page][On to next section]