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VoIP TECHNOLOGY

By:

Ankit KumarBtech IT-4 th year

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About The Company•

Sai Infosystem (India) Ltd., is the largest InformationTechnology (IT) Company of Gujarat having aNationwide presence. Popularly known as “SIS”.

• Company having a group turnover of more than

RS. 1000 Crores.• SIS have pan India presence with 7 branch offices

and over 90 support service centers• one manufacturing unit and having on board over

1000+ IT professionals.• SIS is expanding Globally with subsidiaries in USA,

Hongkong and Dubai already established.

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Contd… • SIS offers total IT solution to various Government

agencies, Department, PSUs, State Governmentsand Corporate as well as scientific institutions.

•

SIS have been ranked 3rd all India by DQ Channelsas an “IT Company providing complete solution”in India.

• SIS are focused on providing total solutions tofour Business Verticals namely Telecom, Power,Defense and e-Governance for state governmentsand PSUs

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Company’s Milestones

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Products

SIS offer a wide range of products and services in thearea of Information Technology :-

• Server Solutions• Desktop• Notebook• Software• SLA Support pack• BPO/KPO• Tools• Telecom products

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VoIP•

A recent application of Internet technology – Voiceover IP (VoIP): Transmission of voice over Internet

• VoIP can be understood as simply a transport

protocol for carrying voice over any packet network,usually between sites.

• More accurately, VoIP refers only to the underlyingtransport protocol that encapsulates voice traffic orvoice media streams and allows them to be carriedover data.

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VoIP Overview

• IP Telephony is a process that enables thetransfer of voice data over a packet switchednetwork as opposed to the traditional circuit

switched network• The transmission of voice packets over the

Internet Protocol (IP) is known as VoIP and isimplemented properly holds the promise of converged networks and unifiedcommunications.

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Why VoIP?

• Free yourself from expensive phone bills withVoIP. VoIP uses your high speed Internetconnection to replace your phone lines. You

use your normal phone just like you've alwaysdone. When you pick up the phone, you heara dial tone. When someone calls, the phonerings. What's different? Voip includes local,long distance, great features, and more in onelow flat fee. All inclusive service, one lowmonthly fee.

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How it works ?

• VoIP works just like a regular phone with just onekey difference - how the phone call actually getsto your telephone. Instead of using the highpriced telephone company's wiring, VoIP routesyour phone calls directly to your telephone usingyour high speed internet connection. You hear adial tone and make your phone calls just likeyou've always done. What's changed is that youdon't pay a big bill to use the phone company'swires..

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H.323 and SIP Protocol

• H.323 consists of a set of protocols that areresponsible for encoding, decoding, andpacketizing audio and video signals, for call

signaling and control, as well as for capabilityexchange.e.g: H .255, H.235, H.245.

• SIP is an application layer control protocol thatcan establish, modify and terminate multimediasessions or calls. It is same as H .323

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Contd…

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Security Issues

• VoIP telephone systems are susceptible toattacks as are any internet-connected devices.

For example:• DoS Attack• Eavesdropping Attack•

Routing packets through firewalls and NATs

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VoIP Advantages• Low cost• Use existing infrastructure• Scalability• Voice mail and fax applications• Call waiting• Caller ID• 3 way calling• Send documents and/or pictures while you talk

at the Same time

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Summary

Voice Over Internet Protocol (VoIP) is anemerging technology that is a criticalcomponent of network centric warfare, and is

associated with potential command center,desktop convergence, mobility enhancements,infrastructure reduction, multi-media

collaboration, and cost avoidance.

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