internettelephony-141027021210-conversion-gate01.ppt

Internet telephony India

1. A
PRESENTATION
ON
INTERNET TELEPHONY

GUIDEED BY R.K.DALAI
PRESENTED BY
LALITA BEHURA
Reg. No-0305247037
Roll No-41

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

3. INTRODUCTION
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

4. 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.

5. 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.

6. 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 PROTOCOLS

7. 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)

8. Public switched telephone 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).

9. PSTN vs. Internet Telephony
Signaling & Media Signaling & Media
Signaling Signaling
Media
PSTN:
Internet
telephony:
China
Belgian customer,
currently visiting US
Australia

10. WHAT AN IDEAL INTERNET
TELEPHONY
•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.

11. CALL PROCESSING
SWITCHING
LINE
CONNECTION
TRUNK
CONNECTION
THE IP TELEPHONY ARCHITECTURE
IP PHONE IP PHONE
SOFTPHONESOFTPHONE
CLIENTCLIENT
MCS 7800 MCS 7800
SERIESSERIES
ETHERNETETHERNET
LAN LAN
SWITCHSWITCH
ROUTER ROUTER
GARTWAYGARTWAY

12. MAJOR VOIP PROTOCOL
•Three major voip protocol are
1) 1.H.323
2) 2.SIP
3) 3.MGCP

13. Fully Meshed TDM Network
H.323
Sydney
Tokyo
New York
London
Los Angeles
Frankfurt
Based on actual and world composites figures from Band-X, 4/01
Amsterdam

14. 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 Data
SIP-T

15. IP backbone
MGC
MGC
MG
MG
MEGACO
MGC – Media Gateway Controller
MG – Media Gateway
PSTN – Public Switched Telephone Network
MEGACO/H.248
Signaling
User DataMEGACO
Private
Network
Private
Network
SIP, H.323,
RTP, AAL 1/2/5

16. INTERNET TELEPHONY HARDWARE
REQUIREMENT
•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

17. 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.

18. DISADVANTAGE
•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.

19. WHAT THE USER GET NOW
Point to multipoint voice.
Data conferencing.
Application sharing.
Long distance telephone saving.

20. IMPACT 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.

21. INDIAN 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.

22. SUMMARY
•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 “

23. Q-A
?????

24. "Always do right. This will gratify
some people and astonish the
rest."
THANK YOU