Voip(2)

PRESENTATION ON VOIP

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AKASH CHICHGHARE(003) MANTHANKUMAR SHAH(019) 10/15/08

An introduction to the basics of Voice over Internet Protocol

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INTRODUCTION You may have heard of VoIP—that it’s the future of telephone service and -That you can save a lot of money using it.

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But what exactly it is??

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Very simply, VoIP, or Voice over Internet Protocol, is the technology that allows us to have phone service over the Internet. VoIP may be a new term for you, but the technology isn’t new. The telephone companies, who use what is referred to as the public switched telephone network (PSTN), have been employing VoIP technology for years.

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Voice-over-IP is a term/technology used in IP telephony for a facilities that manages the delivery of voice information using the Internet Protocol. In general, this means sending voice information in digital packets rather than in the traditional circuitcommitted protocols of PSTN. Yet today, VoIP is becoming a viable solution for mainstream consumers—both businesses and individuals. 10/15/08

IP TELEPHONY OVERVIEW        

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Scalable, Flexible & Reliable – Server-based (cluster) Technology • Combines Voice, Data & Video – Utilizes LAN/WAN Infrastructure – Ethernet IP Phones • Cheaper to Install and Manage • Significant Reduction of Public Telephone Network Usage. 10/15/08

IP Telephony Overview IP Technology   

Ethernet Backbone - CAT5 Connectivity Windows-based Servers

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- Clustered Environment Software Applications (XML)

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LAN/WAN voice, video

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Centralized Management

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PBX Technology

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Dedicated Wiring Required - Dedicated Copper Infrastructure Proprietary Architecture - Single Points of Failure

Tie Line or PSTN Connectivity System Management (MAC)

So why would you want it?  

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The most obvious answer is to save money. VoIP acts as a bridge between your Internet connection and the PSTN. Allowing you to have phone service without requiring an account with the phone company. That, coupled with VoIP’s unique pricing model, means that users can often cut their long-distance calling expenses dramatically.

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Contd…  

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1. Strategic business improvements More efficient operations New features and capabilities 2. Cost savings Long distance toll savings Converged network and lower maintenance

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HOW DOES VOIP WORKS??

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VOIP 

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VoIP works by taking analog signals and converting them to digital data that can be sent over a network —the Internet in most cases, also any private network. It requires that you have a broadband network connection, the necessary items to create that broadband connection— a broadband modem, your computer, a router, etc.— and a device to convert the data. 10/15/08

WAYS TO TALK ON VOIP!!

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Through a web interface: That allows you to make calls from your computer (assuming you have a sound card). And using a VoIP phone or headset (devices that allow you to bypass your computer entirely and link directly to your Internet connection).

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VOIP STRUCTURE

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QOS PLANNING

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PROTOCOLS  Session

Initiation Protocol (SIP)

 H.323  Megaco(H.248)  Skinny

Client Control Protocol

 MiNET  IAX  Skype

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H.323 Features 

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H.323 and SIP are the peer-to-peer protocols for IP networks Private numbering plan and/or E.164 Separate directory service to get number from name Can supply name for display purposes

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H.323 has some features - H.450.x

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Generally the most important ones, e.g., transfer, diversion, call completion

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H.323 Architecture

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SIP FEATURES

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SIP is an application-layer control (signalling) protocol for creating, modifying and terminating sessions with one or more participants.

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Sessions include Internet Multimedia, conferences, Internet Telephone calls and Multimedia distribution.

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Provides toolkit (methods, headers) from which features can be assembled 10/15/08

Contd…

Message

Waiting Indication about to be

published Call

transfer, history information (for call diversion), presence, instant messaging under study.

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Is VoIP secure?

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VoIP is actually more secure than traditional PSTN calls, but because it uses the Internet to transfer data. - It faces the same kind of security issues as other Internet applications. In other words, you need to take the same security precautions with your VoIP system that you’d take to protect your network. 10/15/08

Distributed Call Processing Model

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Centralized Call Processing Model

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Where are we Today?         

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Over Thousands IP Phones Deployed – US, NY / NJ metropolitan area, Atlanta, Dallas, Los Angeles metropolitan area – Europe: Amsterdam, London, Ireland, Paris, Budapest Recognition – Cisco • Awarded Cisco’s 4 millionth IP Phone • Cisco Reference Video – Computer World Article 10/15/08

IP Telephony – Industry Leaders

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CONCLUSIONS – – – –

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Evolution of the voice network is important to many enterprises Traditional and IP networks will continue to coexist in the enterprise Exploitation of new services and applications in IP network But needs to be complemented by extending existing services to IP and mixed environments

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