Voice over Internet Protocol (VoIP) using Asterisk

Voice over Internet Protocol (VoIP) using Asterisk Sameer Verma

about myself

teach: those of us who can't do...
research: open source, mobility, content management
fun: ubuntu, maemo/nokia770, mythtv, nocat...
about myself

agenda introduction asterisk astlinux demo trixbox

family tree openpbx telephony free and open source proprietary asterisk gnu bayonne yate astlinux trixbox xorcom rapid xorcom rapid elastix VoIPonCD

VoIP
more about networking... ...less about telephony

acronyms
VoIP – Voice over Internet Protocol
POTS – Plain Old Telephone Service
ATA – Analog Telephone Adapter
WiFi – Wireless Fidelity
SIP – Session Initiation Protocol
IAX – Inter-Asterisk eXchange
PBX – Private Branch eXchange
SBC – Single Board Computer

advantages
Network based – digital by design
IP based – economies of scale and scope
Crossover to e-mail, IM, etc.
CRM integration – e.g. SugarCRM
No toll boundaries – IP goes everywhere
One infrastructure to worry about

disadvantages
New – adoption issues
Migration from legacy systems will cost $$$
Innovative – requires a big change
How will telcos overbill?
???

design as a network application
If you assess your requirements from a network perspective, the design is more intuitive
Think of VoIP as an application along the lines of e-mail
Accounts follow a <name>@<registrar> syntax
Account may map to a 7 or 10 digit phone number if system relays to POTS lines

asterisk – the project
Asterisk was originally written by Mark Spencer of Digium, Inc.
Released under GPL.
Project began in 1999 or so.
Core PBX + support services such as voicemail, call-forwarding, conference calling, etc.

three scenarios
Home/Hobby use
Small business use
Small-to-Medium Enterprise (SME) use

scenario 1
Hobby/home use
No POTS lines involved.
Extensions for family and friends.
All calls happen on PCs or ATAs.

scenario 2
Small business
One or two POTS lines for incoming/outgoing calls.
Extensions for Tech Support, Sales, Customer Service.
Generic operator extension.
Numeric extensions and voice mail for employees.

scenario 3
Small to mid-size business
Multiple POTS and VoIP lines for incoming/outgoing calls.
Aggregation of lines for multiple calls (rollover dialing).
Specific lines and providers for long-distance and international calling.

astlinux
Linux 2.6
Soekris and WRAP
Asterisk 1.2
mini_httpd + PHP in CGI mode
OpenSSH
OpenSSL
"keydisk" support
traffic shaper (iptables+tc)
tftp server
"PBX Only Mode" - Asterisk only
ftp server (vsftpd)
Sangoma A101/102/104/S518 support
SNMPD for lm_sensors
rp-pppoe

astlinux
Embedded Linux for Asterisk
Live CD ISO is about 70 MB
CF card fits under 64 MB
Targeted for Soekris or WRAP SBCs
Needs Pentium class 266 MHz or better
GUI via web browser
All scripts are editable via textarea boxes on web pages.
Additional stats, PHP, httpd, available via browser

open source maturity model OSMM is a trademark of Navica . A chart like this will make you a hero at work. PHB image used without permission

sample dial plan
Extension 101
Myself
Extension 201
Wife
Extension 301
Kid
SIP SIP IAX

sample family dial plan

sample business dial plan Use IAX for end-points with lesser known variables such as NAT.

ekiga softphone (SIP and H323)

x-lite for MS Windows Image from http://graphics.cs.uni-sb.de/VoIP/fopra/node83.html

iaxcomm

astlinux demo

more complex solutions
Trixbox
Used to be Asterisk @ Home
Combines several open source projects into one distro.
CentOS based
Caution: Wipes out the entire hard drive!!!
If you simply want to “play” with VoIP, use AstLinux live CD.

dev kit used in demo TDM400P from Digium Photo from http://www.marlow.dk/images/asterisk/tdm400p-fxo-small.jpg IAXy S101 from Digium Photo from http://www.voip-info.org/users/385/25385/images/618/IAXy.jpg

trixbox demo

resources
http://www.asterisk.org/
http://www.digium.com/
http://www.openpbx.org/
http://www.astlinux.org/
http://trixbox.org/
http://www.xorcom.com/rapid/index.html
http://yate.null.ro/pmwiki/
http://www.gnu.org/software/bayonne/
http://www.voip-info.org/wiki/
http://www.voip-info.org/wiki/view/AstLinux
http://www.sureteq.com/asterisk/trixboxv1.2.htm

contact

http://www.slideshare.net	52
http://123.30.71.100	10
http://ahmadrais.blogspot.com	7
http://www.voip-routes.com	4
http://sameerverma.org	4
http://192.168.1.120	1
http://unicsolution.com	1
http://redmine.ntis.us.to	1
http://voip-routes.com	1
http://www.techgig.com	1

Voice over Internet Protocol (VoIP) using Asterisk

by Sameer Verma

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