Voip

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SEMINAR ON

Presented by :-Yati Sharma


CONTENTS

Introduction VoIP routing scheme VoIP Technologies VoIP implementation Power of VoIP VoIP Providers Benefits of VoIP Challenges Disadvantages of VoIP


INTRODUCTION

Voice over Internet Protocol (VoIP) is a transmission technology for delivery of voice communications over IP networks.

Internet telephone call are conversion of the analog voice signal to digital format and compression/translation of the signal into Internet protocol packets.

VoIP systems employ session control protocols to control the set-up and tear-down of calls as well as audio codecs.

With VoIP, we can make a call from anywhere we have broadband connectivity.


VoIP Overlay Routing Scheme

Overlay Network Architecture A VoIP overlay network (VoON) consists of VoIP

endpoints, edge nodes and relay nodes

Integration into Call Signaling Signaling phase can be used by a VoON to determine

the most suitable path for the media streams of a call.

Measurements -- The quality of service on candidate routes needs to be

determined at the time a routing decision is made

--The quality of a call in progress needs to be monitored.


VoIP technologies

H.323 IMS SIP RTP

VoIP is a revolutionary technology that has the potential to completely rework the world's phone systems.

Technologies used to implement Voice over Internet Protocol include:

http://en.wikipedia.org/wiki/H.323

http://en.wikipedia.org/wiki/IP_Multimedia_Subsystem

http://en.wikipedia.org/wiki/Session_Initiation_Protocol

http://en.wikipedia.org/wiki/Real-time_Transport_Protocol


VoIP implementations

ATA (analog telephone adaptor)

IP Phones

Computer-to-computer

Voice over IP has been implemented in various ways using both proprietary and open protocols and standards.


ATA( Analog Telephone Adaptor)

ATA allows us to connect a standard phone to our computer or our Internet connection for use with VoIP. The ATA is an analog-to-digital converter. It takes the analog signal from our traditional phone and converts it into digital data for transmission over the Internet.

To connect through ATA, plug the cable from our phone that would normally go in the wall socket into the ATA, and we're ready to make VoIP calls.


IP Phones

These specialized phones look just like normal phones with a handset, cradle and buttons. But instead of having the standard RJ-11 phone connectors, IP phones have an RJ-45 Ethernet connector. These phones allow VoIP calls without the use of a computer. Instead they connect directly to the IP network.

In order to connect to the PSTN they usually require service from a VoIP service provider.

http://upload.wikimedia.org/wikipedia/en/2/2c/Cisco7960G.jpeg


Computer-to-computer

This is certainly the easiest way to use VoIP. We don't even have to pay for long-distance calls. There are several companies offering free or very low-cost software that we can use for this type of VoIP.

We need the software, hardware and an Internet connection, preferably a fast one that would get through a cable or DSL modem.

Except for the normal monthly ISP fee, there is usually no charge for computer-to-computer calls.


The Power Of VoIP

FeaturesCall Waiting

Caller Id

Call Forwarding

Voice Mail

Call Transfer

VoIP has become a powerful force in telecommunications due to several reasons.

cheaper than PSTN service providers compatible with web-based applications enabling the user to change, adjust , or listen to these features over the Internet. Long distance is usually provided free of charge.


VoIP Providers

Providers

Skype

Vonage

Speakeasy

Galaxy Voice

Packet 8


Offer Features For Free stuff

Saves Money And Cost Efficient

Integration With Audio, Data And Video Applications

Ability To Choose Your Own Area Codes

Flexibility

Benefits Of VoIP


Challenges

Quality of Service Susceptibility to power failure Emergency calls Lack of redundancy Caller ID


Disadvantages of Using VoIP

VoIP is dependent on wall power. No way to integrate these products with VoIP. No way to associate a geographical location with an IP

address. It’s susceptible to all the hiccups normally associated

with home broadband services. Phone conversations can become distorted, garbled or

lost because of transmission errors. VoIP is susceptible to worms,viruses and hacking. VoIP is having a phone system dependant on individual

PCs of varying specifications and power.


Conclusion

VoIP is a prospering technology that enables users to place phone calls over internet.

By taking advantages of VoIP specific characteristics, our approach can detect quality problems network failures faster and with less overhead than existing approaches.

VoIP has become a popular method of hiring with outsourcing.

VoIP is able to provide faster problem of recovery with less overhead than existing approaches.


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Date post:	20-May-2015
Category:	Education
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Voip

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