This document outlines a project to deploy a VoIP telephony solution for a company using the open-source Asterisk PBX and FreePBX. The goals are to provide audio conferencing, call distribution, voicemail, instant messaging and call queues through a simple management interface. It describes installing Ubuntu, Asterisk, and FreePBX on a server, and configuring SIP clients. Running Asterisk on a cloud server is also proposed to reduce costs and maintenance compared to an on-premise solution.

1. Elaborated By : Marwen Atallah
Supervised by:
Mr. Mohamed Kharrat
Mr. Sofiene Khlif
Deployment Of VoIP Services with
Asterisk and FreePBX
Tunisian Republic
Ministry of Higher Education, Scientific
Research and Technology
IT department
Master Degree in Networks
and Distributed Applications

2. Schedule

3. Web programming
Mobile application and software design over several platforms
(Android , IOS, Windows Mobile etc…)
Embedded system Development
Challenges:
Mobile and Web Applications may require communication
services
Customers demand deployment of Telephony solutions: call
centers, agencies, companies etc…

4. Goals :
 Deployment of an efficient Telephony solution that provides:
 Audio-conferencing
 call distribution
 Voice-mailing
 Instant messaging (IM)
 Queues holding
 …
 simple way to manage, control and secure all the conmmunication
traffics happening between users.

5. VOIP PSTN
+ Better voice quality
+ Save a lot of money
+ Large bandwidth (more features )
+ Cheap user hardware and software
- High cost
- Low voice quality
- Sensitivity to external disturbances
VoIP Solution ( Voice Over Internet Proctocol)
VoIP / PSTN

6. VoIP Diagram

7. PBX ?
A PBX (Private Branch Exchange) is a system that
connects telephone extensions to the Public
Switched Telephone Network (PSTN) and provides
internal communication for a business.
An IP PBX is a PBX with Internet
Protocol connectivity and may provide additional
audio, video, or instant messaging communication
utilizing the TCP/IP protocol stack.

8. Client/Server Architecture
 PBX  [SERVER]
 End points (extensions)  [Clients]
- Mobilephones
- IP Phones
- SIP Phones
- Any device that supports
VoIP application

9. Survey On Existing Systems
Open-Source Closed-Source

10. License
&
COST
 Open Source
 Freely available (except for some
commercial modules)
 Freely upgradable
 Pay a license for every extension on the system
 Phones are more expensive
 20% - 30% of the system total cost are yearly paid
for Annual support from a Cisco partner
 Upgrades requires purchasing a new software version
Voice Mails
 Free and improved voicemail system
 Included with asterisk installation
 Voicemail to Email ?
 Uses « Unity voicemail » system that relies on a
Microsoft Exchange mail system
 Buy Microsoft exchange licenses for each voicemail
box
 Voicemail administration is seperate from the
System
Accessibility
 Highly customizable Solution and open
architecture
 Accessibility over different operating
systems
 Adjustable to almost all type of phones
 Limited accessibility
 Works with specific type of phones
maintenance  Debugging and Fixing are accessible and
doesn’t require high expertise
 Contact CISCO agents or technical support

11. Asterisk is an open source private automatic
branch exchange (PABX) for UNIX systems.
Among other uses, it provides for voice
messaging,, hold music, enquiry calls, call
distribution and conference calls, etc…

12. Asterisk PBX distibutes
incoming calls to teams of
agents assigned to various
call queues.
 Holding Queues
 Calls Distribution
Asterisk Applications: Call Center

13. Asterisk Applications: VoIP Gateways
 Asterisk builds a bridge between
external telephony lines (PSTN) and
the VoIP

14. Asterisk Applications: Conference
Bridge
 A conference bridge allows a group of people to
participate in phone call
 Meeting rooms can hold dozens or even hundreds
of participants

15. Server Deployement
Commands have to be typed precisely. If there’s a spelling error, command will fail
For someone who has never used CLI, it can be very confusing
Learn a Large amount of commands (hundreds) by heart
Asterisk (CLI)

16. Server Deployement
PBX ( Telephony Engine)
Web-based Graphical User
Interfaces For Asterisk
(dashboard) :

17. • Web-Based Administration: manage and control Asterisk system, using web browsers
from any device
• Built-in Call Reporting: real time basic call reporting included with FreePBX
Web-based configuration GUI for asterisk.Core telephony engine

18. Deployment
ess
Asterisk
Telephony
Engine
FreePBX
Ubuntu
12.04
Install Ubuntu 12.04 Server LTS 32 or 64-bit
Initial System Setup
Install Dependencies
Install and Configure Asterisk
Install and Configure FreePBX
Start FreePBX

19. FreePBX (CLI)
FreePBX (GUI)
192.168.1.90

20. FreePBX (GUI) : Access

21. Clients: SIP extentions
 SIP Client: A SIP client (Soft Phone) plays the
role of an IP telephone but as a software Zoiper
Softphone: Software that allows SIP
based phone calls from a computer,
smartphones

22. Conclusion / Perspectives
The goal of this work was to deploy a Voice over IP solution
for Karwisoft Company, by installing an advanced and inexpensive
telephony system using one of the leading open-source PABXs in
the world, Asterisk.
The execution of this project required the contribution of
many components since it’s a client-server based architecture that
offers many telephony features that can be deployed in many
fields…
Asterisk Over Cloud

23. Why would we want to run the server in the cloud?
In-house Solution
In-house solutions requires specialized server
knowledge
 Expensive ( thousands of dollars )
 Space, cables and wires
Cloud Solution
Lower upfront capital costs
Pay for the server as you use it ( scalability)
Run it in under an hour.
 auto-maintaned and 24/24 available
What is an Amazon EC2 ?
virtual machine web service that provides dynamic
resizable compute capacity in the cloud.

24. SIP (Session Initiation Protocol)
 Asterisk is using a set of VoIP Protocols Such as SIP
SIP is responsible for connecting, monitoring and disconnecting VoIP sessions.
SIP can establish real-time sessions such as online gaming, teleconferencing and
video conferencing.