APRESENTATION

ONINTERNET TELEPHONY

GUIDEED BY R.K.DALAI

PRESENTED BY

LALITA BEHURA Reg. No-0305247037

Roll No-41

“It's probably the most significant shift in the entire history of modern communications, since the invention

of the telephone.”

INTRODUCTIONINTRODUCTION

Internet telephony is a powerful and economical communication option by combination of the telephone network and data networks.

Internet telephony uses internet to send audio between two or more computer users in the real time,so the the user can converse vocal Tec introduced the first internet telephony software product in early 1995

THE FACTORS WHICH IS MAKING INTERNET TELEPHONY POSSIBLE

voice quality is increasing thanks to new codec technology.

There are on going improvements in compression techniques.

Full-duplex PC sound cards enable two way simultaneous calls.

The typical PC is getting more & more powerful,making it possible processor-intensive functions without specialized hardware.

GENERATION OF INTERNET TELEPHONY

The first generation :-Introduction to enable voice conversations user with telephony software-equipped-computers.

The second generation:-it overcomes the difficulties with PSTN interfaces protocols and mapping IP address.

The third generation:-internet telephony starts to receive serious attention.these gateways provides a two-ways interfaces between the PSTN and internet.

IP packets are forwarded across the network by routers

IP Routers do best-effort routing

Voice signals can be prioritized using priority queues

RTP and RTCP keep end points informed of transmission quality.

Call set up is done using Session Initiation Protocol (SIP) or something similar

INTERNET PROTOCOLSINTERNET PROTOCOLS

VOICE OVER INTERNET TELEPHONE

VoIP tries to let go voice (mainly human) through IP packets.

VoIP works like that, digitalizing voice in data packets.

Voice (source) - - ADC - - - - Internet - - - DAC - - Voice (dest)

Public switched telephone Public switched telephone network (PSTN)network (PSTN)

A synonym for traditional circuit-switched telephone networks offered by public telecommunication operators (PTOs), as well as integrated services digital networks (ISDN), and public land mobile networks (PLMN).

PSTN vs. Internet TelephonyPSTN vs. Internet Telephony

Signaling & Media Signaling & Media

Signaling Signaling

Media

PSTN:

Internet telephony:

China

Belgian customer,currently visiting US

Australia

WHAT AN IDEAL INTERNET WHAT AN IDEAL INTERNET TELEPHONYTELEPHONY

High volume call processing within and between public and private networks.

High volume real-time translation between IP and switched networks.

Economic scalability.Broad acceptance and implementations of

standards.

CALL PROCESSING

SWITCHINGLINE

CONNECTION

TRUNKCONNECTION

THE IP TELEPHONY ARCHITECTURETHE IP TELEPHONY ARCHITECTURE

IP PHONE IP PHONE SOFTPHONESOFTPHONE

CLIENTCLIENT

MCS 7800 MCS 7800 SERIESSERIES

ETHERNETETHERNETLAN SWITCHLAN SWITCH

ROUTER ROUTER GARTWAYGARTWAY

MAJOR VOIP PROTOCOLMAJOR VOIP PROTOCOL

Three major voip protocol are

1) 1.H.323

2) 2.SIP

3) 3.MGCP

Fully Meshed TDM Network Fully Meshed TDM Network H.323 H.323

Sydney

Tokyo

New York

London

Los Angeles

Frankfurt

Based on actual and world composites figures from Band-X, 4/01

Amsterdam

IP Network

SIP Server

MGC MGC

PSTN PSTN

TGW TGW

ISUP ISUP

SIP-T

SIP-T

SIP-T

MGC – Media Gateway Controller

TGW – Trunking Gateway

PSTN – Public Switched Telephone Network

MEGACO/H.248

Signaling

User DataSIP-TSIP-T

IP backbone

MGC MGC

MG MG

MEGACO

MGC – Media Gateway Controller

MG – Media Gateway

PSTN – Public Switched Telephone Network

MEGACO/H.248

Signaling

User DataMEGACOMEGACO

Private Network

Private Network

SIP, H.323,

RTP, AAL 1/2/5

INTERNET TELEPHONY HARDWARE INTERNET TELEPHONY HARDWARE REQUIREMENTREQUIREMENT

PC 386 or more & Sound card. Full duplex capable . A network card connected with internet. Hardware accelerating cards . Quicknet PhoneJack Quicknet LineJack VoiceTronix V4PCI VoiceTronix VPB4

VoiceTronix VPB8L

ADVANTAGES:ADVANTAGES:

In VoIP mechanism you can talk all the time with every person you want (the needed is that other person is also connected to Internet at the same time), as far as you want (money independent) and, in addition, you can talk with many people at the same time.

Exchange audio data with people and also simultaneously sending images, graphs and videos.

DISADVANTAGEDISADVANTAGE Integration between VoIP architecture and

Internet. voice data communication must be a real time stream (you couldn't speak, wait for many seconds, then hear other side answering): this is in contrast with the Internet

Heterogeneous architecture that can be made of many routers (machines that route packets),which has a very high round trip time (RTT), so we need to modify something to get it properly working.

WHAT THE USER GET NOW

Point to multipoint voice.Data conferencing.Application sharing.Long distance telephone saving.

IMPACT ON THE IT MARKETIMPACT ON THE IT MARKET

Will IP Telephony be able to cut cost?Ans:-It depends on the organistions ability

to reduce the costs associated with infotech personnel,network equipment and the transmission services.

INDIAN DIASPORAINDIAN DIASPORA

In Indian context we need to cut the costs

for the people to be enabled to connected to the world and change the living styles.

SUMMARYSUMMARY

Business acceleration in this century is directly related to the success of IT organization's ability of giving a competitive edge

“Convergence of all communication traffic onto a packet network “

Q-AQ-A

??????????

"Always do right. This will gratify "Always do right. This will gratify some people and astonish the some people and astonish the

rest." rest."

THANK YOUTHANK YOU