presentation on voip(navneet)

7/31/2019 Presentation on VOIP(Navneet)

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VOICE OVER INTERNET

PROTOCOL

PRESENTED BY

Navneet Saraff & Ritvik Shah


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OVERVIEW

VoIP is Voice over Internet Protocol (IP)based network

Voice over Internet Protocol, VoIP describes

the category of hardware and software thatenables people to make telephone calls viathe Internet. Voice signals are converted topackets of data, which are transmitted on

shared, public lines, hence avoiding the tollsof the traditional, public-switched telephonenetwork (PSTN).


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OVERVIEW (CONT.)

VoIP uses the Internet Protocol (IP) totransmit voice as packets over an IPnetwork.

VOIP can be achieved on any datanetwork that uses IP, like the Internet,Intranets and Local Area Networks (LAN).

The voice signal is digitized, compressedand converted to IP packets and thentransmitted over the IP network.


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OVERVIEW (CONT.)

VoIP services need only a regular phoneconnection, while others allow you tomake telephone calls using an Internet

connection instead.


5/36PC Configurationfor VoIP


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WHATITDOES?

VoIP can allowyou to make acall directly from

a computer, aspecial VoIPphone, or a

traditional phoneusing an adapterto another VoIPphone or regular

phone.


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TRANSMISSIONOF VOICE USING IP NETWORKS

Step 1: Because all transmissions mustbe digital, the callers voice is digitized.

Step 2: Next using complex algorithms the

digital voice is compressed and thenSeparated into packets; and using theInternet protocol, the packets are

addressed and sends across the networkto be reassembled in the proper order atthe destination.


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TRANSMISSION OF VOICE USING IP NETWORKS(CONT.)

Step 3: During transmission on the Internet,packets may be lost or delayed, or errors maydamage the packets. Conventional error

correction techniques would requestretransmission of unusable or lost packets, but ifthe transmission is a real-time voicecommunication that technique obviously would

not work, so sophisticated error detection andcorrection systems are used to create sound tofill in the gaps.


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TRANSMISSION OF VOICE USING IP NETWORKS(CONT.)

Step 4: After the packets are transmittedand arrive at the destination, thetransmission is assembled and

decompressed to restore the data to anapproximation of the original form.


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INTERNET TELEPHONY

The use of the Internet that was originallydesigned to carry computer data to carryvoiceoA packet switched network

Voice was originally carried over circuitswitched networkso

PSTN


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CONNECTINGTOREGULARPHONE

To make a call froma VoIP phone to aregular phone youneed a VoIP service

provider(eg.FreewayCommunications orVonage) who have

equipment that routethe calls to thePSTN.

ServiceProvider

PSTN

Switch from digital toanalog

Digital

Analog


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ADVANTAGESUSING VOIP RATHER PSTN

When you are using PSTN line, you typically payfor time used to a PSTN line manager company:more time you stay at phone and more you'll pay.

In addition you couldn't talk with other that oneperson at a time.In opposite with VoIP mechanism you can talk allthe time with every person you want (the needed

is that other person is also connected to Internetat the same time), as far as you want.


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ADVANTAGESUSING VOIP RATHER PSTN(CONT.)

(money independent) and, in addition, youcan talk with many people at the same time.talk with many people at the same time.

If you're still not persuaded you canconsider that, at the same time, you canexchange data with people you are talking

with, sending images, graphs and videos.


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SIGNALINGAND MEDIA

A VoIP call is composed of two parts.1.Signaling.- The use of signals for

controlling communications. The signalingdoes the call set up, locate users, teardown sessions.

2.Media- After the call has been setup themedia transports the voice packets


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PROTOCOLS Examples of protocols are SIP, H323In computing, a

protocol is a convention or standard that controls orenables the connection, communications, and datatransfer between two computing endpoints. ExampleTCP/IP, http, ftp.

In the field of telecommunications, acommunications protocol is the set of standardrules for data representation, signaling, authentication,and error detection required to send information over

a channel


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TYPESOF VOIP ARCHITECTURE

PC-to-PC PC-to-Phone Phone-to-Phone Note: In the above listing phones can be

either analog or digital phones


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ALTERNATIVE VOIP ARCHITECTURES

Phone to Internet to Gateway to PSTN

Internet

GATEWAY

PSTN


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PC TO PHONE CONNECTION

Made over the Internet for connecting PCto phones

Sample Product:oNet2Phone

Need to pay for the calls but they arerelatively inexpensiveo

Cheaper compared to phone to phonecalls made over the Internet


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PC to PC

Internet


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PC TO PC CONNECTION

Made over the internet for voiceconnection

Sample product:oNet2PhoneoNetMeeting

Calls are free

for example, MSN Messenger or Skype.


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Phone to Phone via the Internet

Internet


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PHONETO PHONE CONNECTION

Phone to phone calls are made over theInternet

A special phone will connect to a hub or

switch on the network PSTN to PSTN when the caller would use

a special adaptor for his telephone

for example, BT Broadband Voice orGossiptel.


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ALTERNATIVE VOIP ARCHITECTURES PSTN to Gateway to Internet to Gateway

to PSTN

Internet

GATEWAYGATEWAY

PSTN PSTN


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TYPICAL LAYOUT

ATA


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VOIP PHONE

Cisco 7970 IP Phone


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PSTN(public switched telephone network)to Gateway to Internet to Gateway toPSTN

-Vonage Uses this Architecture


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PSTN VS INTERNET

PSTN

Voice networks usecircuit switching.

Dedicated pathbetween calling andCalled party.

Bandwidth isreserved in advance.

Cost is based on

distance and time.

INTERNET

It uses packetswitching.

No dedicated pathbetween sender andreceiver.

It acquires andreleases bandwidth, asit is needed.

Cost is not dependent

on time and distance.


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MAINREGULATORYISSUESAROUND VOIP

Emergency calls Call interception Caller location

Numbering Directory assistance & phonebooks Universal service

PSTN availability


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ADVANTAGESOF VOIP

Greater Efficiency Lower Cost Higher Reliability Supporting Innovation


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CUSTOMER DEMANDS OF VOICE TODAY VERSUSNATIONAL SECURITY (CONT.)

Support operational flexibility. Maintain operationregardless of the network health/status of anyinterconnected networks.

Support backward and forward compatibility. Thismeans more than just simple network growth. Theability to maintain communications between networktypes regardless of the software or hardware versionsin place is an enormous benefit to the users of theInternet.

Adaptive/Dynamic Routing This is an importantcapability during these times of national security.


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QUALITYOF SERVICE

QoS involves the following Subjectiveneeds: Does the service meet the customers

needs? Is the service easy to use?QoS parameters can be divided into thefollowing categories: Availability Mean Time Between Failure (MTBF) Reliability


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QUALITYOF SERVICE (CONT.)

Delay both perceived and measured Security Bandwidth

Information Loss bit error rate; videoand audio


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THE BENEFITSOF VOICEOVER IP

Cost reduction - low cost phone calls. Convergence of data/voice networks

unification.

Simplification and consolidation -centralized management.


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CONCLUSION

As data traffic continues to increase andsurpass that of voice traffic, theconvergence and integration of these

technologies will not only continue toimprove, but also will pave the way for atruly unified and seamless means ofcommunication. Implementing VoIP canprovide significant benefits and savings toyour company.


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