1. The Open Source Telephony www.cat-hackers.com

2. 3. Session's Goals

Main Goals

What's Asterisk ?

What benefits me to know about

Asterisk ?

How can I use this new technology?

4.

What are the circumstances that led to

Asterisk ?

Enter Asterisk:

• - Some basic Voice Over IPconcepts.

- Some basic telephony concepts.

Session's Goals 5.

Interactive Voice Response IVRand voice Mail.

Security Issues.

Session's Goals 6.

Telephony's Concept

What's a telephone ?

For most of us it's nothing morethan a communication device.

For others,it's a complexelectronic device they cannot livewithout.

7.

Telephony's Concept

Telephony is considered highly

simplisticfrom the user's point of

view.

We will know about:

Central Office ExchangeCOX

Private Branch Exchange PBX

8.

Understanding Asterisk

So , what's a PBX?

PBX stands for :

Private Branch eXchange.

PBXs make connections amongthe internal telephonesof

a private organization.

9.

Understanding Asterisk

The primary advantage of PBXs was cost savings oninternal phone calls.

How?

10.

Understanding Asterisk

By handling the circuit switchinglocally.

Compare the cost of 3 phonesconnected directly to a COX ,

and between 3phones connectedto a PBX.

11. 1 2 PBX COX company 12. OldCOX 13.

Understanding Asterisk

PBXoriginallyconnectsphones to the PSTN.

PBX incorporates telephones,fax machines, modems, andmore .

14.

Understanding Asterisk

Two developments during the1990s led to new types of PBXsystems.

The result was developing an

IP PBX .

15.

Understanding Asterisk

The First reason :

The massive growth of datanetworks.

The Second reason :

The understanding of packetswitching.

16.

Understanding Asterisk

we can use packets inswitchingdata .

And we can use them inholdingvoicealso.

Since Internet isa global delivery system, so it's easy.

17.

VoIP's Concept

VoIP allows voice to become nothing more than anotherapplication in the data network.

We can send and receive voice ,like sending and receivingdata packets .

18.

Understanding Asterisk

VoIP PBX supportsVoIP besidesPSTN .

It can connect IP phone toPSTN phone , and vice versa.

So,it's linked to both the VoIPprovider and the PSTN Provider.

19. 20.

Understanding Asterisk

For a PBX to do it's functionautomatically , there should bea mind controlling it .

This mind isa software installed on it .

21.

Understanding Asterisk

This software or this mind is something like :

Asterisk

22.

Understanding Asterisk

This software will not just routeinward and outward calls.

It can provide other serviceslike IVR and Voice Mail.

It acts as a talking human.

23.

What'sAsterisk ?

It is basically a software PBX.

Originally written by MarkSpencer , founder of Digium.

24.

What'sAsterisk ?

Open Source Concept.

Asterisk is an open source,converged telephony platform.

Asteriskruns on Linux ,

MAC& BSD.

25.

What'sAsterisk ?

With Asterisk , no one istelling you how your phonesystem works.

Asteriskimposes no limits.

26.

What'sAsterisk ?

Asterisksupports the followingboth technologies :

VoIP .

PSTN.

27.

What'sAsterisk ?

With Asterisk , we can make:

An IP phone calls a PSTNphone.

A PSTN phone calls an IPphone .

28.

What'sAsterisk ?

PSTN phones in one office calleach other.

IP phones in one office call eachother.

An IP connected PC calls an IPor PSTN phone .

29.

What'sAsterisk ?

You can makevirtual officesinmany regions that acts as thereal ones .

You can make a Voice Mail ,and IVR system , thatrespondsinstead of you .

30.

What'sAsterisk ?

You can make the caller hears an announcement at specific time Every Monday...

You canredirectthe caller to another person in another office for consultation.

31. Asterisk PBX Asterisk PBX 32.

Building Asterisk

1- Requirements for the PBX :

one PC (x86) with a 500 MHzPIII processor.

some decent amount ofRAM.

33.

Building Asterisk

Decent power supply.

Linux installed Other Unixbased OS s are OK.

Digiumcards to plug in oursystem to our local PSTN.

34. Digium Cards 35. Building Asterisk 2-Install the system : Like any Linux Distro!. See the Video! See the real system! 36. Building Asterisk 3-Make your configurations! All are GUI windows . 4-Connect your PSTN & IPphones. 5-Connect your fax machines ,your PCs , ... . 37. All is GUI ! 38. IP Phones 39.

IVR

IVR is one of the services whichAsterisk supports.

IVR stands for InteractiveVoice Response .

IVR is something like :

Welcome to Telecom Egypt ConductCentre .... !

40.

IVR

From theGUI menus, go to Voice Menu .

You will find more than 17 stepsto configure your IVR system.

Make your configurations !

41.

IVR

You can make the caller enters apassword or not .

You can make the caller hangedup .

You can direct the caller toanother person.... .

42. 43.

IVR

To make the caller hears acertain message ,just record it.

Then , form the configurations ,determine the case of thismessage .

44.

IVR

You can make the caller hearsthis message on 6 thof October!

You can set the time for whichthe user replys to your messageby pressing any key.

45. IVR see the video ! 46.

Summary

Circuit Switching .

PBX and COX.

VoIP PBX.

Asterisk as a PBX software .

What Asterisk Allows us to do .

Building a real PBX .

How IVR works .

47. Questions? 48. Please Feed Back ! Thanks! www.cat-hackers.com