Implementation of a
Management System for a
Web-Based PBX Server
Student: Phuong-Nhung Bui
Advisor: Dr.-Ing. Chao-Huang Wei
EE Department
Southern Taiwan University
Contents
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1
2
3
4
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Motivation
Introduction
System Configuration
Communication Protocol
Applications
Conclusion and Further Works
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Motivation
Due to:
 Rapid growth of global internet connections.
 Trend of the client/server applications.
Classical PBX need be enhanced to cope
with this trend.
This paper proposes a PBX server for
remote online management.
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Introduction
PBX (Private Branch Exchange) is a
telephone exchange device that serves a
particular business or office, PBXs make
connections
among
the
internal
telephones of a private organization —
usually a business office — and also
connect them to the PSTN (Public
Switched Telephone Network) via trunk
lines.
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Targets of the Server

Application:
 Billing system .
 Caller’s personal data .
Will be used in hotels, office or
dormitories .
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PBX Server Functions
PBX server
 Collects some information from the
incoming and outgoing telephone calls.
 Records data to a MySQL database.
 Provides web pages written in PHP and
HTML.
 Allows authorized user to access these
data through internet using simple web
browser .
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System Configuration
PBX Server
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System Configuration
The PBX server requires a
web server installed together
with a server-side, and a
database.
 Using open source software
for application development
makes it cost effective and
flexible.
Web Browser
Internet
Web Server
PHP Scrips
Server-side
MySQL Database
RS232
PBX
PSTN
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Database
MySQL
 Program providing multi-user, multi-threaded
and robust SQL (Structured Query Language)
database server .
 Main features: speed, robustness,
flexibility to store large data .
and
 Freeware
The database server of choice .
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Web Server
Apache web server
 Responsible for accepting HTTP requests
from the users’ browser .
 Fast, stable and feature-full open source web
server..
 Runs under multitasking operating systems .
 Capable of handling simultaneous requests .
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PHP scripting language
PHP: scripting language
 Usually used for web development and can be
embedded into HTML.
 Generally runs on a web server, taking PHP
code as its input and creating web pages as
output.
 Suited for web database applications :
• Supports wide range of databases .
• Tools that integrate the web and
environments .
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database
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Server Actions
Request from user
Web server executes PHP code that link to MySQL
to get information and generates webpage
Resolves the user’s control
messages to the server-side
Send command to PBX
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Data Recording
Server-side receives information about
incoming and outgoing calls
Records them to MySQL
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Server Program
Listening socket
Opened RS232 port
Create a listening
socket on a
specific port
Waiting for
package
Listen connection
Package go in?
N
Y
Client request ?
N
Record to MySQL
Y
Create connection
Receive control
message
Send control
message to PBX
Close conection
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Message Format
0
1
2
3
4
5
6
7
0123456789012345678901234567890123456789012345678901234567890123456789012345678901
$T I:94/03/22 200 201
01 88677253576
$TO:94/03/22 200 201
01 88677253576
Max.
26 digits
telephone
Tranfer
Source
Date
Month
Year
0000 12: 33: 44 00343 00000
0000 12: 33: 44 00343 00000
Call
duration
Second time
Minute
Hour
Account
Format of incoming and outgoing message
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Control commands
Two important control command to the
PBX:
 "check in" function:
• From server-side to PBX: "CI 20", 0Dh, 0Ah
• From PBX to server-side: "OK CI 20", 0Dh, 0Ah or
“Can’t find out physical number! " 07h, 07h, 0Dh,
0Ah
 “check out” function:
• From server-side to PBX: "CO 20" 0Dh, 0Dh
• From PBX to server-side: "OK CI 20", 0Dh, 0Ah or
“Can’t find out physical number! " 07h, 07h, 0Dh,
0Ah
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Applications
Based on the proposed server, a billing
system and a personal information
management are developed for the PBX.
Application is implemented on a PC with
Fedora Core installed .
This application is constructed with the
information pre-recorded in a database
which is obtained by the server-side .
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MySQL database
MySQL
database
includes
telephone charge tables:




many
Local telephone calls .
Long distance calls .
Cell-phone calls .
International calls and its international dial
code .
PBX server calculates the charge of outgoing
calls.
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System Login
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Telephone Management
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Telephone Billing
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Personal information
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Conclusion & Further
Works
The proposed PBX server has been
successfully deployed .
Authorized manager can access the
server to check all outgoing telephone
calls and the charge of each call or total
expense of one telephone set.
Telephone owner can check his (her)
spend and view historical record of
telephone calls, and the caller’s personal
data .
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Conclusion & Further
Works
Convenient user’s interface via internet
web browser to access the PBX server.
Data security also provided to protect the
system from unauthorized access .
Further extension for some additional
functions, such as phone line wired home
security and remote control.
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