1. Asterisk from beginning to advanced (part 1) Part 1 Used:
Debian 8 libreoffice Email: [email protected] License: GPLV3 Get
latest version of this slides and see Other projects and tutorials:
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2. What is Asterisk?What is Asterisk? Asterisk is an open
source framework for building communications applications. Asterisk
turns an ordinary computer into a communications server. Asterisk
powers IP PBX systems, VoIP gateways, conference servers and other
custom solutions. It is used by small businesses, large businesses,
call enters, carriers and government agencies, worldwide. Asterisk
is free and open source
3. written in the C Programming Language running on Linux (or
other types of Unix ) powering Business Telephone Systems
connecting many different Telephony protocols a toolkit for
building many things: an IP PBX with many powerful features and
applications VoIP Gateways Conferencing systems supporting VoIP
Phones as well as PSTN and POTS speaking SIP , the most common VoIP
protocol, among others What is Asterisk?What is Asterisk?
4. What Can You Do With Asterisk?What Can You Do With Asterisk?
Asterisk is a framework for building multi-protocol, real- time
communications applications and solutions. Asterisk is to realtime
voice and video applications as what Apache is to web applications:
the underlying platform.
5. You can use Asterisk to build communications applications,
things like business phone systems (also known as PBXs) and: call
distributors VoIP gateways and conference bridges. Voicemail Call
Recording Audio and Video Conferencing What Can You Do With
Asterisk?What Can You Do With Asterisk?
6. What Do I Need To Know To Use Asterisk?What Do I Need To
Know To Use Asterisk? The Asterisk framework itself is built by
developers for developers. If you want to create applications and
solutions with Asterisk you will need a working knowledge of Linux,
script programming, networking and telephony.
7. TelephonyTelephony Telephony is the field of technology
involving the development, application, and deployment of
telecommunication services for the purpose of electronic
transmission of voice, fax, or data, between distant parties. The
term is also used frequently to refer to computer hardware,
software, and computer network systems, that perform functions
traditionally performed by telephone equipment. In this context the
technology is specifically referred to as Internet telephony, or
voice over Internet Protocol (VoIP)
8. What Is A PBX?What Is A PBX? A PBX (Private Branch Exchange)
is a system that connects telephone extensions to the Public
Switched Telephone Network and provides internal communication for
a business
9. Key PBX FeaturesKey PBX Features VoIP Ready: The world is
moving away from legacy PSTN lines and towards VoIP. Voice
Messaging: Once upon a time, voicemail was an optional add-on.
Mobility. Conferencing: One of the best ways to cut down on travel
costs is teleconferencing. Reporting: If you cant measure it, you
cant manage it.
10. What Is A IP PBX?What Is A IP PBX? 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
11. Key IP PBX FeaturesKey IP PBX Features The features of an
IP PBX are similar to the features of a normal PBX but are
typically enhanced with features taking advantage of
Internet/intranet connectivity, such as: Unified
communications/unified messaging Voicemail transcription (speech to
text) Find me/follow me Call recording Least-cost routing/MPLS call
routing Extension mobility VoIP phone/soft phone connectivity
12. Plain old telephone servicePlain old telephone service
Plain old telephone service (POTS) is voice-grade telephone service
employing analog signal transmission over copper loops
13. Public switched telephone networkPublic switched telephone
network The public switched telephone network (PSTN) is the
aggregate of the world's circuit-switched telephone networks that
are operated by national, regional, or local telephony operators,
providing infrastructure and services for public
telecommunication
14. Voice over IPVoice over IP Voice over IP (VoIP) is a
methodology and group of technologies for the delivery of voice
communications and multimedia sessions over Internet Protocol (IP)
networks, such as the Internet
15. Session Initiation ProtocolSession Initiation Protocol The
Session Initiation Protocol (SIP) is a communications protocol for
signaling and controlling multimedia communication sessions The
most common applications of SIP are in Internet telephony for voice
and video calls, as well as instant messaging all over Internet
Protocol (IP) networks.
16. VoIP gatewayVoIP gateway A VoIP gateway is a gateway device
that uses InternetProtocols to transmit and receive voice
communications (VoIP) A VoIP gateway is used to build a bridge
between the worlds of legacy telephony and the VoIP. Gateways are
typically used to connect legacy phone systems (PBXs or ACDs) with
VoIP resources, or to connect modern VoIP phone systems with legacy
phone lines.
17. Key VoIP Gateway Facts & FeaturesKey VoIP Gateway Facts
& Features Gateways come in several formats. Analog gateways
convert between VoIP protocols and traditional analog phone lines
and/or phones. Digital gateways convert between VoIP and various
kinds of digital phone services: T1, E1, PRI and/or BRI, depending
on the gateway. Gateways can typically connect to multiple VoIP
endpoints (devices or services), which allows PSTN resources to be
shared between multiple IP communications systems.
18. Conference BridgeConference Bridge A conference bridge
allows a group of people to participate in phone call. The most
common form of bridge allows participants dial into a virtual
meeting room from their own phone. Meeting rooms can hold dozens or
even hundreds of participants
19. Asterisk OS Asterisk can run on multiple base architectures
including embedded systems and there are no strict requirements on
CPU speed or memory size. Asterisk can run on a number of Operating
Systems. Linux is the only officially supported OS, and it is
recommended to use a 2.6.25 or higher kernel A current and
supported release of distributions such as CentOS or Debian is
recommended.
20. Asterisk & Linux distributionAsterisk & Linux
distribution freepbx-distro Streamlined and Secure We've watched
the FreePBX space develop with many different flavors of distros
that each add their varying personalities and extras. At FreePBX
we've focused on Security and a Streamlined System that is
supported by the same team who brings you the core
application.
21. Asterisk & Linux distributionAsterisk & Linux
distribution AstLinux AstLinux is a "Communications and Network
Appliance" open source software distribution. Unified
communications including voice, presence and messaging, provided by
Asterisk
22. Asterisk & Linux distributionAsterisk & Linux
distribution Elastix Elastix is an Open Source Software to
establish Unified Communications. About this concept, Elastix goal
is to incorporate all the communication alternatives, available at
an enterprise level, into a unique solution.
23. Elastix Features Some of the basic Features of Elastix
include: Voicemail Fax-to-email Support for softphones Web
Interface Configuration Virtual conference rooms Call recording
Least Cost Routing Extension Roaming PBX Interconnection Caller ID
CRM Advance Reports
24. Asterisk & Linux distributionAsterisk & Linux
distribution AsteriskNOW What is AsteriskNOW? Install Asterisk and
start building custom telephony applications with AsteriskNOW.
AsteriskNOW makes it easy to create custom telephony solutions by
automatically installing the "plumbing." It's a complete Linux
distribution with Asterisk, the DAHDI driver framework, and, the
FreePBX administrative GUI. Much of the complexity of Asterisk and
Linux is handled by the installer, the yum package management
utility and the administrative GUI. With AsteriskNOW, application
developers and integrators can concentrate on building solutions,
not maintaining the plumbing.
25. LicensingLicensing Asterisk Asterisk is distributed under
the GNU General Public License version 2 and is also available
under alternative licenses negotiated directly with Digium, Inc.
Elastix Elastix is an open source entrepreneur tool released under
the license GPLv2. You are free to use it for commercial of
personal purposes subject to the conditions as described under its
License.
26. Download asteriskDownload asterisk Site:
http://www.asterisk.org/downloads Latest Version 13.3.2 (when these
slides creates) Download source and extract it. Dependences:
'glibc-devel', 'ncurses-devel', 'openssl-devel' and 'zlib-devel' or
similar. svn (client cli)must be installed in your system
http://subversion.apache.org Instructions: go to contrib/scripts
folder and run install_prereq script (with root) to automatic
install dependences contrib/scripts ./install_prereq install
contrib/scripts ./install_prereq install-unpackaged
27. Install asterisk from sourceInstall asterisk from source
debian8@localhost:/usr/src/asterisk-13.3.2#sudo ./configure
debian8@localhost:/usr/src/asterisk-13.3.2# sudo make
debian8@localhost:/usr/src/asterisk-13.3.2# sudo make menuselect
[optional] debian8@localhost:/usr/src/asterisk-13.3.2# sudo make
install debian8@localhost:/usr/src/asterisk-13.3.2# sudo make
samples The previous command make samples created sample
configuration in: /etc/asterisk/
28. File StructureFile Structure The table below contains the
default installation paths for Asterisk component files and
libraries. Default Installation Paths Path Description
/etc/asterisk Configuration files /usr/sbin Location of binary
executable /var/log/asterisk message(error) logs and CDR
usr/lib/asterisk/modules Component module libraries
30. backupsbackups Asterisk configure file location is
/etc/asterisk Backup useful files in this locations: mv
modules.conf modules.conf.sample mv extensions.conf
extensions.conf.sample mv sip.conf sip.conf.sample mv iax.conf
iax.conf.sample
31. Useful commandsUseful commands launch Asterisk in the
foreground mode (not a daemon) asterisk -vvvc V : very very verbose
C : get a command line console core show help To start the PBX
using your sound card, you can type "console dial" to dial the PBX
Then you can use "console answer", "console hangup", and "console
dial" to simulate the actions of a telephone man asterisk
32. Best practiceBest practice he purpose of this document is
to define best practices when working with Asterisk in order to
minimize possible security breaches and to provide tried examples
in field deployments. This is a living document and is subject to
change over time as best practices are defined.
33. SectionsSections * Filtering Data: How to protect yourself
from redial attacks * Proper Device Naming: Why to not use numbered
extensions for devices * Secure Passwords: Secure passwords limit
your risk to brute force attacks * Reducing Pattern Match Typos:
Using the 'same' prefix, or using Goto() * Manager Class
Authorizations: Recognizing potential issues with certain classes
of authorization * Avoid Privilege Escalations: Disable the ability
to execute functions that may escalate privileges
34. Additional Links links that contain useful information
about best practices or security are listed below. * Seven Steps to
Better SIP Security:
http://blogs.digium.com/2009/03/28/sip-security/ * Asterisk VoIP
Security (webinar): http://www.asterisk.org/security/webinar/
35. aboutabout Email : [email protected] License : GPLV3 Other
project and tutorials: https://github.com/m-gh/ Get latest version
of this slides form: https://github.com/m-gh/
