Asterisk - OpenSource PBX
Ameya Pandit

What is pbx?
Private Branch Exchange:
An exchange system used in companies and
organizations to handle internal and external
calls.

What IS VOIP ?
Network Transmission types
Signaling : TCP e.g. h323:1720, SIP:5060

RTP (RealTime Transport Protocol): UDP


What is Asterisk and why Asterisk ?
Freedom of OpenSource
No Legacy System
Very Customizable
More features than EPBX

What Asterisk Can Do for you?
Interactive Voice Response

Call Forward – Waiting etc

Authentication

Conference Bridging

Fax Transmit and Receive

Call Detail Record


Installing Asterisk
a. Obtain SourceCode
b. Extracting the Source Code
c. The Zapata Telephony Drivers
d. Compiling libpri
e. Compiling Asterisk

Directories Used by Asterisk
/etc/asterisk/

/usr/lib/asterisk/modules/

/var/lib/asterisk

/var/spool/asterisk/

/var/run/

/var/log/asterisk/


Dialplan Configuration
[incoming]
exten => s,1,Answer( )
exten => s,2,Echo( )
Whatever you say, the Echo( ) application
will relay back to you.

Session Initiation Protocol
Application Layer Signalling Protocol

Use port 5060

RTP to Trasnport Media

Communication between 2 endpoints

not the first, and is not the only


Asterisk VoIP: User Agents Clients
Soft Phones Software
Windows Based:
X-Lite & X-Pro from X-Ten networks

Firefly from FreshTel networks.

SJPhone from SJ labs.

Linux Based:
KPhone, a SIP phone for the KDE

environment.
More SIP User Agents

http://www.voip-info.org

X-Lite client

Asterisk VoIP: User Agents Clients :
Hardware Phones
Cisco: Cisco 7960,7940 and ATA186 SIP
SNOM
GrandStream

Cisco Phone at Magnet

Connecting to the Console
To start the Asterisk process
# /usr/sbin/asterisk
Enabling Verbosity and Debugging
# core set verbose 10
# core set debug 10

Asterisk In Magnet
Customized Dialplan

Call Detail Recording

Authentication

Call routing

VoiceMail sent as Attachment

Fax Email Gateway


Thank you.
Ameya Pandit
Magnet Technologies Pvt Ltd.
ameya.pandit@magnettechnologies.com
Contact : +91 22 6719 2000