Design and Implement VOIP PBX for a Small Office: (University Name)

This project proposal outlines the design and implementation of a VOIP PBX (Voice over Internet Protocol Private Branch Exchange) system tailored for a small office environment. The project addresses the transition from traditional EPBX systems to IP-PBX, emphasizing the benefits of ease of design and maintenance. The project encompasses two primary goals: designing and implementing an IP-PBX system, and configuring it. The deliverables include various PBX design types (Hosted PBX, Managed PBX, Session Border Controller, Sonus SBC, and Cloud hosted IP-PBX), server hardware requirements, configuration steps, creating extensions, configuring softphones and IP desk phones, testing internal calls, setting up IVR, and enabling voicemail. The solution uses technologies like FreePBX, X-Lite softphone, and RingRoost for IVR development. The project also covers external communication setup and resources needed, including knowledge of communication types, IP addressing, and virtual machine environments. The student details the process of setting up a professional PBX system, including broadband router, IP-phone, a central server, SIP trunk, and digital telephony cards.

Design and Implement a VOIP PBX for a small office
(Student Name)
(City’s Name)
(University‘s Name)
Abstract: Most organizations uses EPBX for telephony
communication. This type of telephony communication has
been replaced by IP-PBX which is easy to design and
implement
Keyword: IP-PBX system
I. Introduction
To install a phone system, one needs to assess
the needs of the organization and then choose the desired
solution. There are two choices when implementing a
VOIP system. One can either install an IP voice system
or Private branch exchange (IP PBX) which handles all
aspects of the phone system. The paper will show how
one goes about installing VOIP PBX phone system.
II. Rationale for the project
Most of small organizations uses Electronic
private branch exchange system for telephony
communication with all its internal workers. Such
system uses a lot of maintenance work. This can only be
avoided by changing telephony system to IP-PBX
system where the users will be able to be connected via
their laptops or user desktop computers through a
software referred to as softphone.
III. Project goals and objectives
This project involves delivering two major goals which
are:
 How to about design and implement a IP-PBX
system for a small organization
 How to go about configuring a IP-PBX system
IV. Deliverables
A. Five types of PBX design
1. Hosted PBX design
Hosted PBX is one type of design that provides
all features and functions of a standard PBX
system without having a managed on site. In here
an external provider manages the system off the
organization premise and delivers the system via
the internet. This is as shown below

2. Managed PBX type of design
This type of design condenses the organization
network to a more thoroughly manage and controls a
business’s IP box. As shown by the figure below the
design integrates LAN and WAN
3. Session Boarder Controller
This is a type of design that is implemented by
those organizations that sits between public and private
network. As shown by the diagram below, a SBC allows
different parts of a network to communicate via SIP
message
4. Sonus SBC type of design
This is type of design where Sonus SBC
1000/2000 work as the man in the middle between a
legacy PBX and PSTN carrier. This is as shown by the
figure below

5. Cloud hosted IP-PBX design
This is a type of design that manages calls from one
phone number. This is a shown by the figure below
B. VOIP PBX solution
IP PBX is a telephony system which provides
telephone calls over IP data networks. In here all
conversations are sent as data packets over the corporate
network [1] . Figure one below shows VOIP PBX
solution with over 30 users
Fig. 1: hosted IP-PBX proposed solution
C. Server hardware requirements
The network will include IPPPBX server that will
consist of Intel Atom board. In addition, the server will
be of 500GB hard-disk, super cool cabinet, CD-ROM,
and 2 GB RAM. Also the server will include a dual
Ethernet card and one static IP which ought to be
provided by the internet service providers [2].
D. Configurations

To create extensions the server will be assessed by
typing http://192.168.47.112 on the web browser [3]. It
will appear as shown by the screen shown below
Fig 2: The initial page of the server
One then logins by clicking on the top side on switch to
login to administrative mode by just typing maint as the
username and password as the password. In here
dashboard appears as shown by figure 3
Fig 3: Server dashboard
E. Creating PBX and SIP phone extensions
To create PBX extension one just go to
freePBX dashboard and then go to set-up and then click
of the extension tab [4]. This is shown by figure 4 below
Figure 4: Creating extensions
F. Configuring Softphone and IP desk phones
In PBX system soft phone is a software which is
installed on the desktop. After creating extensions one
can then go ahead to configure softphone on client-user
system that might be windows, MAC, or Linux. There
are number of client softwares which are available for
such systems but this paper goes for X-Lite that is
readily available on counterpath website. After
successful installation of both extensions that was
created in the PBX server, it is now configured on the

soft phone by entering the SIP proxy settings details [5].
The look of X-lite soft phone is as shown below
Fig 5: X-Lite Softphone
By filling the SIP proxy settings, the SIP phone
will communicate with the IPPBX server and shown user
extension number as shown by figure 5 above
G. Testing internal calls
To test internal calls, one needs to dial internal call
extensions number directly. If the internal number is
1234568 one needs to dial 91234568
H. Creating IVR
To set-up an IVR one need to leverage the
ringroost PBX builder which providers a user interface
for developing IVR. In here one only needs to sign-up
RingRoost from their official site
Set-up two answering the call as shown by figure
below
Lastly is setting up an IVR menu and connecting
the menus as shown by figures shown below

I. Enabling Voicemail
In here one only needs to dial *98 on the
registered SIP phone. Second is entering voicemail box
number. Lastly is entering the password and the PIN for
one voicemail box, then pressing 0 and pressing 2 to
record one name.
J. Configure PBX to make more professional
To configure PBX to make it more
professional one needs to set-up an on premise PBX
system. This means full small businesses PBX
deployment. In here the organization will need to have a
broadband router, IP-phone, a central server, SIP trunk,
and digital telephony cards.
V. Project resources
To deliver this project, all the project
participants need to have the knowledge of the various
communication types, understand both IP v4 and version
6. This is because various phones are configured to one
of the said IP addresses. Other basic known that one
needs to have areVMWARE for windows platforms and
Oracle virtualBox. In addition one needs to understand
the various communication protocols.
V. Any other information relevant to
this project
A. Communicating with the outside world
Users can get connected to the worldwide,
the extensions ought to be configured on the IPPBX
server that has static IP address which is provided by the
ISP. In addition one needs to connect miniSIPServer to
VOIP provider [6]. In here in the main window one
needs to click External lines button to add external line
information as shown below

On the window that appears one click add on external
line with the CallCentric account information
REFERENCES

[1] A. Robar and J. Zimmer, FreePBX 2.5 powerful telephony solutions : configure, deploy, and maintain an enterprise-class VoIP PBX,
Birmingham: Packt Pub, 2012.
[2] L. Chaffin, Building a VoIP network with multimedia communication... by Larry Chaffin, Oxford: Oxford : Elsevier Science, 2003.
[3] L. Dang, C. Jennings and D. Kelly, Practical VoIP using VOCAL, Beijing, 2006.
[4] S. V. Subramanian and R. Dutta, Measuring SIP Proxy Server Performance, New York: John & Wiley Press, 2013.
[5] D. Kelly, C. Jennings and L. Dang, Practical VoIP Using VOCAL, O'Reilly Media, Inc, 2016.
[6] C. Riley and M. E. Flannagan, Best damn Cisco internetworking book period, MA : Syngress, 2013.