VoIP for development - · PDF filePedagogical approach vs. a list of commands ... How can I...

VoIPVoIPfor developmentfor development

Authors Alberto Escudero-Pascual Louise Authors Alberto Escudero-Pascual Louise BerthilsonBerthilson

(cc) Creative Commons (cc) Creative Commons Attribute Non-Commercial Share-Alike 25Attribute Non-Commercial Share-Alike 25

Based on VoIP-4D PrimerBased on VoIP-4D PrimerBuilding voice infrastructure in developing regionsBuilding voice infrastructure in developing regions

Unit 16Unit 16

TRICALCAR | wwwwilacnettricalcar - Version March 2008 2

ObjectiveObjective

To understand the basic concepts related to VoIP

To introduce the benefits of Asterisk and software based solutions in implementing VoIP networks

To present the great challenges in developing regions

To present a practical case study of introducing VoIP services


MotivationMotivation

When living in Tanzania in 2004

Two big challenges Technical knowledge is not available in the local

languages The absence of low-cost IP infrastructure (voice

and data)

The proprietary solutions were not flexible enough


VoIP guide for developmentVoIP guide for development

40 pages of introduction to VoIP

Do it yourself approach

Pedagogical approach vs a list of commands

The guide wants to serve both the technical and general public

Aimed at developing regions and their specific problems


VoIP guide for development (2)VoIP guide for development (2)

The document is available in four languages (en es fr ar)

Licenced under Creative Commons Non-Commercial Share-Alike

Now included in the second Spanish edition of the book WNDW

The chosen distribution channel is Internet

Funded by IDRC (Acacia initiative)


Table of contentsTable of contents

PART 1

Introduction to VoIP

VoIP basic foundations

Equipment hardware

PART 2

How can I create my PBX (more information in the guide and practical section)

PART 3

A case study


Evidence of VoIP explosionEvidence of VoIP explosion

Telecommunications deregulation allowed the emergence of new operators MCI (wwwmcicom) Qwest (wwwqwestcom) Level3 (wwwlevel3net) Vonage (wwwvonagecom)

gt42 million lines in service March 2006 Skype (wwwskypecom)

200 million downloads November 2005 gt5 million simultaneous users January 2006


The traditional suppliers buy ldquodatardquo companies IP divisions are created Tradtional telecom services suppliers

Siemens Alcatel Ericsson

IP equipment suppliersCisco 3Com Nortel Networks

VoIP services appear httpwwwpulvercomproductssip

ConvergenceConvergence


The magic potionThe magic potion

1 VoIP

Carrying telephone conversations as IP packets

2 Open standards

Allow everyone to implement compatible communication systems interoperability

3 Free and open source software

Learn from existing experiences and share our results


Our magic potionOur magic potion

We have access to both software and hardware that allow us to exchange calls

We have access to an open and public network (Internet)

We are able to adapt and modify technology to meet our needs


A typical questionA typical question

Why not use Skype or Google Talk


The short answerThe short answer

FlexibilityAppropriation

Opportunity

Sustainability


The recipe in detail (Contents)The recipe in detail (Contents)

PBX (the base)

PSTN (Public Switched Telephone Network)

Comparison between IP and PSTN signalling

VoIP equipment (the terminals)

Quality of Service Codecs Latency and Jitter


What is a What is a PBXPBX

Private (Automatic) Branch Exchange

Definition for the layperson

It allows sharing one or more telephone lines with multiple users

Routing of incoming and outgoing calls

The (personal) owner of the system takes routing decisions and decides how to share the external phone lines with the users


PBX advantagesPBX advantages

Value-added services Call Transfer Three way calling Voice mail Interactive Voice Response (IVR)

services


What is What is AsteriskAsterisk

A free implementation of a telephonic switch (Central office or exchange)

It allows associated ldquophonesrdquo to establish calls among them and connect to any other telephone subnet



Created by Mark Spencer (Digium) Based on previous work of Jim Dixon

(Zapata Telephony Project)

Runs better under GNULinux


PSTN PSTN

Public Switched Telephone Network The global network of circuit-switched

telephones The amalgamation of all circuit-

switched telephone subnets in the world

The network that will become obsolete -)


PSTN vs InternetPSTN vs Internet

Flow of information Channel vs individual datagrams

Data processing Inside the netwok vs the edges

Standards setting organizations ITU vs IETF

Routing mechanisms Telephone numbers vs IP addresses


Signalling in traditional Signalling in traditional telephonytelephony

ldquosignallingrdquo and ldquodatardquo are separated into different channels

signalling Is responsible for the establishment and

status of the ldquocallrdquo Is used in coordination with the billing

systems


Signalling in PSTN Signalling in PSTN

PBXs are the PSTN ldquoroutersrdquo

Two components according to the role FXO = Foreign Exchange Office FXS = Foreign Exchange Station


Foreign Exchange Office (FXO)Foreign Exchange Office (FXO)

Any device behaving as a ldquotelephonerdquo

Accepts signalling on-hookoff-hook busy

Starts and receives phone calls


Foreign Exchange Station (FXS)Foreign Exchange Station (FXS)

Generates dial and ring tones

In analogue lines Generates calling pulses Provides DC voltage to telephone

terminals


Do not forgetDo not forget

An FXS connects to an FXO and viceversa In the same way as a phone line (FXS) connects to a phone (FXS)

An FXS is an active element that feeds a passive element (FXO)


FXO FXS in a PBXFXO FXS in a PBX

The PBXs that have an FXO and an FXS can connect to the PSTN and to terminals

The telephone lines coming from the operator must be connected to the FXO interface of the PBX

Your office phones must be connected to the FXS interfaces of the PBX


FXO and FXSFXO and FXS

An analogue phone is an FXO device

connected to a telephone line (PSTN) acting as

an FXS



An Analogue Telephony Adapter or ATA acts as an FXS



A PBX can be fitted with either FXS or FXO

interfaces


Analogue signallingAnalogue signalling

The signals transmitted between FXS and FXO are

Dial and busy tones

Ring tone

On-hook and off-hook


Analogue signalling (2)Analogue signalling (2)

Signalling methods vary from place to place

Two of the most common methods are ldquoloop startrdquo and ldquoground startrdquo

The PSTN (ATampT ITU) traditionally uses SS7



In the PSTN voice and data are separated One ldquocircuitrdquo is for the voice (the conversation) A second ldquocircuitrdquo is for supervisory and

administrative signalling (SS7)

These information circuits do not have to use the same physical channel


Signalling in IP telephonySignalling in IP telephony

Signalling and conversations are separated (as in the PSTN)

Each signalling mechanism represents a ldquocultrdquoof followers



Dozens of protocols and their cults H323 (Telco) SIP (Internet) Session Initiation Protocol IAX2 (Community) Inter-Asterisk

eXchange


SIPSIP

A protocol developed by IETF

Responsible for Setting up the calls and other signalling

tasks Authentication Negotiating the quality of the phone

call Handling the port numbers and IP

addresses involved in voice flow


SIP and mobilitySIP and mobility

SIP Proxy servers facilitate the establishment of phone

calls acts as an intermediary that knows how

to find a certain phone number in the network (where the user was initially registered)

IP telephony allows to physically move the phone numbers


SIP proxy serversSIP proxy servers


Phone calls and NATsPhone calls and NATs

Calls (voice) are transmitted using a protocol called RTP (Real-time Transport Protocol

In a network with a Network Address Translator (NAT) a set of machines share a routable IP address

The NATs are the big enemies of RTP


RTP y NATRTP y NAT

Pros NATs are easy to implement They connect machines without requiring

more network resources Great acceptance and products


RTP and NAT(2)RTP and NAT(2)

Cons Limitations on the real traffic routing It is difficult to create services within a NAT They create audio problems with VoIP networks

(eg listening only to the party within the NAT who initiates the call)

Unfortunately public IP addresses are a scarce resource in developing regions


IAX2IAX2

Created as part of the development of the PBX Asterisk

It uses a bidirectional flow to send the voice (SIP uses two independent flows)

It works much better (always) in the presence of NATs

It allows merging conversations taking place at the same time thus saving bandwidth Trunking


Why is Why is IAX2 better than SIPIAX2 better than SIP

1)It minimizes the bandwidth used per call

2) It incorporates native support of NATs and it is easier to integrate with firewalls

3) It further minimizes the use of bandwidth when making many simultaneous calls


VoIP EquipmentVoIP Equipment

The base

PBX

The terminals

VoIP telephones Soft phones Analogue Telephone Adaptors (ATA)

Connection to PSTN

PSTN interface cards


PBXPBX

Components

Motherboard VIA Mini-ITX Epia M10000

Chassis Morex Mini-ITX Chassis Cubid 2688

Hard drive 40 GB IDE UDMA133

Memory 512 MB DDR PC3200 400MHz

Today price 1000 USD

Expected 100-150 USD (IP04 2008)


PBXPBX


VoIP telephoneVoIP telephone

Dedicated VoIP equipment

When buying a VoIP phone do not forget

1) Support for high-compression codecs2) A good administrator interface3) A good audio output

Price today USD 100-120Expected lt$ 50 (2008)



Thompson Speedtouch2030

Four IP lines

Web Interface

Hands-free

Price today USD 125


VoIP Telephones (WiFi)VoIP Telephones (WiFi)

Zyxel Prestige 2000W

WiFi VoIP

One of the first models

Price USD 300 (2005)


SoftphonesSoftphones

PC installed software

Requirements A sound card A firewall that does not block VoIP

Price 0 USD



X-lite

0 USD

Download httpwwwxtencom



iaxComm kiax

Supports IAX

0 USD

Download

httpiaxclientsourceforgenet


Analogue Telephone Adaptor Analogue Telephone Adaptor (ATA)(ATA)

Connects an analogue telephone to a VoIP network

It has an RJ-11 (phone jack) and an RJ-45 (Ethernet jack)

An ATA is an FXS adaptor It ldquotalksrdquo analogue with the phone While ldquotalkingrdquo digital with the VoIP network


ATAATA

Digium IAXy

One of the first

(the first) with IAX2 support

Low power

consumption

Price 95 USD (2005)


ATAATA

Gateway IP- IAX IAD100 with one FXS

It integrates an ATA with support for IAX2 and an NAT

Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD


PSTN interface cardsPSTN interface cards

Needed to connect our VoIP network to the PSTN

It can incorporate FXO and FXS modules

These cards traditionally used Digital Signal processors (DSP)

Current trend is to move the intelligence to the CPU (agrave la WinModem)


PSTN Interface PSTN Interface

TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD


Other aspectsOther aspectsQuality of ServiceQuality of Service

The ability of a network to provide better service to certain network traffic

Optimize the available bandwidth (codec)

Control jitter Minimize latency


CodecsCodecs

Coderdecoder

It is employed to digitize voice into data and viceversa

Higher compression leads to greater distortion

One codec is better than another if it provides better voice quality using less bandwidth


CodecsCodecs

PSTN normally uses PCM (Pulse Code Modulation)a codec that needs 64 kbps

Two very common PCM standards are micro-law (G711micro) USACanadaJapan A- law (G711a) rest of the world

Since G711 does not have large processing requirements it is available in almost all equipments


CodecsCodecs

G711 codec is not appropriate in developing countries because it needs too much bandwidth

We must use other codecs that use less bandwidth such as GSM or Speex

G729 is a good codec but it has the disadvantage of requiring a license


JitterJitter

Variation in the arriving time ldquobetweenrdquo packets

Due to network congestionroute changes or clock drift

A jitter buffer can help alleviate this problem at the cost of additional latency


Latency (delay)Latency (delay)

The time it takes for a packet of data (datagram) to get from one designated point to another

In VoIP networks we must try to minimize the latency by giving priority to the voice traffic


Latency Latency

Latency cannot be reduced below the propagation time of the signal In satellite links ~ 300 ms

Always install your PBX where your network is less congested


VoIP implementation VoIP implementation challengeschallenges

Technical Avoiding the negative impact of NAT

Supporting infrastructure Wireless network with great latency and

jitter Networks that have not been designed to

prioritize real time services



Energy There are no reliable sources of energy

Regulatory Framework Illegal Service Need for licenses


RecommendationsRecommendations

Technical Use IAX2

Supporting infrastructure Wireless networks Use the 5 GHz band (IEEE

80211a) Use protocols with TDMA in urban areas (WiMAX)

Incorporate QoS



Energy Low power consumption equipment solar energy

Regulatory Framework Lobby Business Models


PART 2 ndash Hands onPART 2 ndash Hands on


The componentsThe components

1 PC with Asterisk Any distribution of the Linux operating system

2 VoIP telephones Alternative 2 PCs with 2 soft phones


You can build a portable PBX You can build a portable PBX

Mini-ITX board with Digium TDM400P Card


First steps First steps Installing Asterisk Installing Asterisk

Download the code

Compile

Learn the basic commands


Configuration filesConfiguration files

Step 1

Define and configure communication channels

Step 2

Define ldquorulesrdquo for the extensions (create a dial plan)


A communication channel in Asterisk is like a virtual phone wire

The channels are your virtual PBX wires

On the Internet you can have more than one conversation on the same physical channel

In this section you need to define the type of channels (SIP IAX connection to the PSTN etc)

Communication channelsCommunication channels


Communication channels (2)Communication channels (2)

Asterisk lets you interconnect devices that use different protocols

You can connect devices with IP support (VoIP Phones ATA Softphones) with other digital and analogue devices (PSTN ISDN PRI BRI)



Each type of channel technology is configured in a specific file (sipconf iaxconf zapataconf etc)


Define extensions rules (create Define extensions rules (create youryour dial plan) dial plan)

All incoming and outgoing calls use the channels that you have previously defined

The dial rules indicate how channels interact


Define extension rules (create yourDefine extension rules (create your dial plan) dial plan)

This intelligent aspect of routing between calls is specified in the extensions file (extensionsconf)

The extensions file is known as the dial plan


Asterisk followsAsterisk followsthe old telephony operators the old telephony operators logic logic

To make a call (via two communication channels)

We contact the operator (PBX)

We indicate the person we want to contact

The operator makes the connection depending on the type of line (extensionsconf file)


PARTE 3 ndash Case studyPARTE 3 ndash Case study


Implementation example

Fantsuam Foundation Wireless ISPKafanchan Nigeria

VoIP as a business model


Kafanchan NigeriaKafanchan Nigeria

Schools

NGOs

Health sector

Religious sector

Private sector

Individuals




Network BackboneNetwork Backbone


Sectors in serviceSectors in service


Network topologyNetwork topology


Inclusion of VoIP in the NOCInclusion of VoIP in the NOC


Wireless hub equipmentWireless hub equipment


Client equipment + VoIP ATA Client equipment + VoIP ATA


ConclusionsConclusions

The convergence of telephony is unstoppable The future is moving toward an integrated IP network

Open standards the Internet and FOSS (Asterisk) allow us to implement VoIP networks

The developing regions have to deal with very specific local challenges access to bandwidth energy and an apropriate network infrastructure


httpvoip4dit46se

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ObjectiveObjective

To understand the basic concepts related to VoIP

To introduce the benefits of Asterisk and software based solutions in implementing VoIP networks

To present the great challenges in developing regions

To present a practical case study of introducing VoIP services






and data)


















PART 1



Equipment hardware

PART 2


PART 3

A case study














1 VoIP


2 Open standards















Opportunity

Sustainability



PBX (the base)















services











PSTN PSTN
















systems














terminals














an FXS







interfaces




Dial and busy tones

Ring tone



















eXchange


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

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and data)


















PART 1



Equipment hardware

PART 2


PART 3

A case study














1 VoIP


2 Open standards















Opportunity

Sustainability



PBX (the base)















services











PSTN PSTN
















systems














terminals














an FXS







interfaces




Dial and busy tones

Ring tone



















eXchange


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

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PART 1



Equipment hardware

PART 2


PART 3

A case study














1 VoIP


2 Open standards















Opportunity

Sustainability



PBX (the base)















services











PSTN PSTN
















systems














terminals














an FXS







interfaces




Dial and busy tones

Ring tone



















eXchange


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

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Slide 90














1 VoIP


2 Open standards















Opportunity

Sustainability



PBX (the base)















services











PSTN PSTN
















systems














terminals














an FXS







interfaces




Dial and busy tones

Ring tone



















eXchange


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

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Slide 87

Slide 88

Slide 89

Slide 90












Opportunity

Sustainability



PBX (the base)















services











PSTN PSTN
















systems














terminals














an FXS







interfaces




Dial and busy tones

Ring tone



















eXchange


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

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Slide 80

Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90



PBX (the base)















services











PSTN PSTN
















systems














terminals














an FXS







interfaces




Dial and busy tones

Ring tone



















eXchange


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

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Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90











services











PSTN PSTN
















systems














terminals














an FXS







interfaces




Dial and busy tones

Ring tone



















eXchange


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

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Slide 79

Slide 80

Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90











PSTN PSTN
















systems














terminals














an FXS







interfaces




Dial and busy tones

Ring tone



















eXchange


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

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Slide 79

Slide 80

Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90












systems














terminals














an FXS







interfaces




Dial and busy tones

Ring tone



















eXchange


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

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Slide 79

Slide 80

Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90














terminals














an FXS







interfaces




Dial and busy tones

Ring tone



















eXchange


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

Slide 4

Slide 5

Slide 6

Slide 7

Slide 8

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Slide 11

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Slide 79

Slide 80

Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90














an FXS







interfaces




Dial and busy tones

Ring tone



















eXchange


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

Slide 4

Slide 5

Slide 6

Slide 7

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Slide 11

Slide 12

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Slide 79

Slide 80

Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90







interfaces




Dial and busy tones

Ring tone



















eXchange


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

Slide 4

Slide 5

Slide 6

Slide 7

Slide 8

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Slide 10

Slide 11

Slide 12

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Slide 71

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Slide 73

Slide 74

Slide 75

Slide 76

Slide 77

Slide 78

Slide 79

Slide 80

Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90




Dial and busy tones

Ring tone



















eXchange


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

Slide 4

Slide 5

Slide 6

Slide 7

Slide 8

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Slide 11

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Slide 73

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Slide 76

Slide 77

Slide 78

Slide 79

Slide 80

Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90


















eXchange


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

Slide 4

Slide 5

Slide 6

Slide 7

Slide 8

Slide 9

Slide 10

Slide 11

Slide 12

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Slide 89

Slide 90


SIPSIP




















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

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Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90















RTP y NATRTP y NAT









IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

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Slide 87

Slide 88

Slide 89

Slide 90







IAX2IAX2












The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

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Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90








The base

PBX

The terminals


Connection to PSTN



PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

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Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90


PBXPBX

Components








PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

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Slide 80

Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90


PBXPBX










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

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Slide 78

Slide 79

Slide 80

Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90










Four IP lines

Web Interface

Hands-free

Price today USD 125




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

Slide 4

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Slide 80

Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90




WiFi VoIP







Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

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Slide 80

Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90





Price 0 USD



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

Slide 4

Slide 5

Slide 6

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Slide 79

Slide 80

Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90



X-lite

0 USD




iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

Slide 4

Slide 5

Slide 6

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Slide 80

Slide 81

Slide 82

Slide 83

Slide 84

Slide 85

Slide 86

Slide 87

Slide 88

Slide 89

Slide 90



iaxComm kiax

Supports IAX

0 USD

Download








ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

Slide 2

Slide 3

Slide 4

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ATAATA

Digium IAXy

One of the first


Low power

consumption

Price 95 USD (2005)


ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

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ATAATA



Price 110 USD


ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

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ATAATA

Sipura SPA-3000

A mini-PBX

Price 170 USD









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

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Slide 90









TDM400P

wildcard 1FXO +1

FXS (Digium)

Price 190 USD







CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

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CodecsCodecs

Coderdecoder





CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

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CodecsCodecs





CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

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CodecsCodecs





JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

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JitterJitter









Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

Slide 1

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Latency Latency















Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

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Technical Use IAX2



Incorporate QoS
















Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

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Download the code

Compile




Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

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Step 1


Step 2





































Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

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Schools

NGOs

Health sector

Religious sector

Private sector

Individuals





















httpvoip4dit46se

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VoIP for development - · PDF filePedagogical approach vs. a list of commands ... How can I...

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Transcript of VoIP for development - · PDF filePedagogical approach vs. a list of commands ... How can I...