Voice over Internet Protocol (VoIP) using Asterisk

(1)

Voice over Internet Protocol

(VoIP) using Asterisk

Dr. Sameer Verma, Ph.D.

Associate Professor

Information Systems

San Francisco State University

San Francisco, CA USA 94132

[email protected]

(2)

(3)

teach: those of us who can't do...

research: diffusion and adoption (open source, mobility)

fun: ubuntu, maemo/nokia770, olpc/sugar, mythtv,

nocat...

(4)

demo

agenda

(5)

openpbx

family tree

telephony

free and open source

proprietary

asterisk

gnu bayonne

yate

(6)

VoIP

more about networking...

...less about telephony

(7)

acronyms

●

VoIP – Voice over Internet Protocol

●

POTS – Plain Old Telephone Service

●

ATA – Analog Telephone Adapter

●

DTMF – Dual Tone Multi Frequency

●

SIP – Session Initiation Protocol

●

IAX – InterAsterisk eXchange

●

PBX – Private Branch eXchange

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advantages

● Network based – digital by design

● IP based – economies of scale and scope

–

Crossover to email, IM, etc.

–

CRM integration – e.g. SugarCRM

● No toll boundaries – IP goes everywhere

(9)

disadvantages

● New – adoption issues

● Migration from legacy systems will cost $$$

● Innovative – requires a big change

● How will telcos overbill?

● ???

(10)

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

(11)

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, callforwarding, conference calling,

etc.

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three scenarios

● Home use

● Small business use

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scenario 1

● Home use

–

No POTS lines involved.

–

Extensions for family and friends.

–

All calls happen on PCs or ATAs.

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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.

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scenario 3

● Small to midsize business

–

Multiple POTS and VoIP lines for incoming/outgoing

calls.

–

Aggregation of lines for multiple calls (rollover

dialing).

–

Specific lines and providers for longdistance and

international calling.

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dial plan

(17)

sample dial plan

● Extension 101

–

Me

● Extension 201

–

Wife

● Extension 301

–

Daughter

Asterisk

101 Ekiga SoftPhone

on Ubuntu

201 XLite

on Windows XP

301 Telephone + ATA

SIP

IAX

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presencebased dial plan

● Extension 101

–

me

● Extension 102

–

myself

● Extension 103

Asterisk

Laptop (mobile)

Desktop (office)

IAX

SIP

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sample family dial plan

Extension

Member

Protocol

Location

101 Myself

SIP

San Francisco

201 Wife

SIP

San Francisco

301 Kid

IAX

San Francisco

102 Mom

SIP

Chattanooga

202 Dad

IAX

Chattanooga

302 Brother

IAX

New Delhi

103 Sister

IAX

Hyderabad

203 Cousin

SIP

Aberdeen

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Extension

Member

Protocol

Location

1 Sales

SIP

San Francisco, CA

2 Customer Service

SIP

San Francisco, CA

3 Technical Support

SIP

Hyderabad, India

101 VP Biz Dev

SIP

San Jose, CA

102 VP Ops

SIP

Columbus,OH

111 Dev Team Lead

IAX

Bangalore, India

222 QA Team

IAX

Dhaka, Bangladesh

333 CRM team

IAX

London, UK

555 Asia Rep

IAX

Singapore

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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

●

rppppoe

(22)

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

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astlinux config

CD iso

VMWare

image

Compact

Flash

USB Keydisk

OS Image

config+log+voicemail

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edit config

● astlinux requires hand editing config files

–

extensions.conf

–

sip.conf

(31)

astlinux config

extensions.conf

sip.conf

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trixbox dial plan

Extension

Phone

Protocol

Location

101 SIP

Mobile

102 SIP

Mobile

103 SIP

San Francisco

104 IAX

105 XLite on Laptop

SIP

Mobile

111 Desk Phone

SIP

SF State

Ekiga on Laptop

Gizmo on Nokia

Ekiga at Home

(41)

trixbox

Trixbox

at

SF State

101 Ekiga on Ubuntu

(Laptop)

102 Gizmo on Nokia 770

103 Ekiga on Ubuntu

104 POTS Phone via IAXy

(PenLUG)

111 POTS Phone at

SF State

105 XLite on Windows

(Laptop)

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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

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resources

●

http://yate.null.ro/pmwiki/

●

http://www.gnu.org/software/bayonne/

●

http://www.voipinfo.org/wiki/

●

http://www.voipinfo.org/wiki/view/AstLinux

●

http://www.sureteq.com/asterisk/trixboxv1.2.htm

●

http://dumbme.voipeye.com.au/trixbox/trixbox_without_tears.htm

(46)

Voice over Internet Protocol (VoIP) using Asterisk

Voice over Internet Protocol

(VoIP) using Asterisk

Dr. Sameer Verma, Ph.D.

Associate Professor

Information Systems

San Francisco State University

San Francisco, CA USA 94132

[email protected]

teach: those of us who can't do...

research: diffusion and adoption (open source, mobility)

fun: ubuntu, maemo/nokia770, olpc/sugar, mythtv,

nocat...

demo

agenda

openpbx

family tree

telephony

free and open source

proprietary

asterisk

gnu bayonne

yate

VoIP

more about networking...

...less about telephony

acronyms

VoIP – Voice over Internet Protocol

POTS – Plain Old Telephone Service

ATA – Analog Telephone Adapter

DTMF – Dual Tone Multi Frequency

SIP – Session Initiation Protocol

IAX – Inter­Asterisk eXchange

PBX – Private Branch eXchange

advantages

●

Network based – digital by design

●

IP based – economies of scale and scope

–

Crossover to e­mail, IM, etc.

–

CRM integration – e.g. SugarCRM

●

No toll boundaries – IP goes everywhere

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

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, call­forwarding, conference calling,

etc.

three scenarios

IAX – InterAsterisk eXchange

Crossover to email, IM, etc.

Think of VoIP as an application along the lines of e

_{<name>@<registrar>}

voicemail, callforwarding, conference calling,

Small to midsize business

Specific lines and providers for longdistance and

XLite

presencebased dial plan