PRESENTED BY: PRIYANKA SINGH

BRANCH:ETCREG NO.050122034

VoIP’s OutlinesVoIP’s Outlines

Introduction

How it works

Connection

Security Issues

Drawbacks

RequirementsWorking of voip

WHAT IS VOIP?

Voice over IP is the technology of digitizing sound , compressing it, breaking it up into data packets,and sending it over an IP(internet protocol) network where it is reassembled, decompressed,and converted back into an analog wave form.

VoIP is a technology that allows you to make voice calls using broadband internet connection instead of traditional phone line.

Simply the Future replacement of PSTN (public switched telephone network) .

Voice over Internet Protocol is the transport of voice over IP based data networks like WAN, MAN and LAN.

Many vendors and technology organizations are involved in VoIP Technology such as Cisco, VocalTec, 3Com, Microsoft, USRobotics and NetSpeak.

VOIP INFRASTRUCTURE

REQUIREMENTS OF VOIP

EQUIPMENTS REQUIRED: A broadband (high speed Internet) connection is

required. A computer, adaptor, or specialized phone is

required. Sound card,speakers.

SOFTWARE REQUIREMENTS

Voice Processing Module - to prepare voice samples for transmission.

A PCM Interface – to receive samples from the telephony interface(eg.voice card) and forward them to VoIP software for further processing.

Idle Noise Detection – to supress packet transmission on the network when there no voice signals to be sent.

Call Signaling Module – to serve as a signaling gateway which allows calls to be estabilished.

The Packet Voice Protocol – to encapsulate

compessed voice and fax data for transmission over the network.

HARDWARE REQUIREMENTS

Media/VOIP Gateways(gateways)

• They are used for call admission and control and also for bandwidth management.

• Create VoIP packets from analogue voice signal using CODECs.

IP NETWORK The IP network connects the, often distributed, elements of a VoIP network. As VoIP traffic is sensitive to delay, Quality of Service must be maintained.

Full Duplex Voice Cards which allow both communicating parties to

speak at the same time - as often happens in

reality.

WORKING OF VOIP

VoIP services convert your voice into a digital signal that travels over the Internet. If you are calling a regular phone number, the signal is converted to a regular telephone signal before it reaches the destination.

WAYS OF MAKING VOIP CONNECTION

The three ways are:

COMPUTER TO COMPUTER This mode is the most common, as it is so easy and free.

You need to have a computer connected to the Internet, with the necessary hardware to speak and listen (either a headset or speakers and a microphone).You can install voice communication software like Skype and you are ready to talk.

Nepal Telecommunications Authority 11September 2004

PHONE TO PHONE

This mode is very handy. It implies using a phone set on each end to communicate.

There are two ways in which you can use phones to make VoIP calls:

• Using IP Phones

• Using an ATA

Nepal Telecommunications Authority 17September 2004

PHONE TO COMPUTER AND VICE

VERSA

SECURITY THREATS IN VOIP Identity and service theft

Vishing

Call tampering

ADVANTAGES

Voice and Data Integration Fault tolerant design Network Efficiency Cost reduction Data integrity

DISADVANTAGES AND IMPLEMENTATION CHALLENGES

The quality and overall reliability of the phone connection is entirely reliant upon the quality, reliability, and speed of the internet connection.

Emergency calls, cannot easily be routed to a nearby call center, and are impossible on some VoIP systems .

CONCLUSION

VoIP is one of the most happening sectors of telecommunication technologies where people can send voice and data at relatively cheap rates. Considering the applications and economic benefits of the technology, and the fact that more companies are joining the VoIP bandwagon with their own neat little applications, it may be expected that the future belongs to VoIP.