BY JAISHANKAR KUMAR KIST BBSR

1. A TECHNICAL
SEMINAR
ON
IP TELEPHONYIP TELEPHONY
BY
JAISHANKAR
KUMAR
(1201214265)(1201214265)
ELECTRONICS &
TELECOMMUNICATION
ENGINEERING

2. Introduction
• Internet telephony uses the Internet protocol
to send audio, video an data between two
or more users in the real time.
• IP telephony is the integration and
convergence of voice and data networks,
services, and applications.
• . In 1996, Vocaltec with an Intel Company
announced to produce the first IP telephony
gateway.

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Different Types Of
IP Telephony
• PC to PC
• Phone-to-phone over IP
• PC-to-Phone
• Phone-to-PC

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PC to PC
Figure 1 (ref: www.iec.com)

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Phone-to-phone over IP
using Gateways
Figure 2 (ref: www.iec.com)

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Phone-to-phone over IP
using Adapter Boxes
Figure 3 (ref: www.iec.com)

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PC-to-Phone or Phone-to-
PC
Figure 4 (ref: www.iec.com)

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Different type of IP telephony
Standard
• H.323 standard
• Session initiation protocol (SIP)
• Media gateway to media controller protocol
(MGCP)

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What is H.323
• The H.323 standard for the transmission of
real-time audio, video, and data
communications over packet-based
networks based on IP telephony.
• Currently the most widely-supported IP
telephony signaling protocol.

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H.323 Components
• Terminals
• Gateways
• Gatekeepers
• Multipoint Control Units (MCUs)

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• Terminals :
H.323 terminal can either be a personal
computer or a stand-alone device, running
an H.323 and the multimedia applications.
• Gateways :
An H.323 gateway provides connectivity
between an H.323 network and a non-H.323
network.

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Gatekeepers
• Call Authorization
• Call Management

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Multipoint Control Units:
• MCUs provide support for conferences of
three or more H.323 terminals. All terminals
participating in the conference establish a
connection with the MCU.

14. Protocols Specified by H.323 :
• real-time transfer protocol (RTP)
• real-time control protocol (RTCP)
14

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Real-Time Transport
Protocol
• Real-time transport protocol (RTP) provides
end-to-end delivery services of real time
audio and video.
• RTP is used to transport data via the user
datagram protocol
Real-Time Control Protocol
(RTCP)
• RTCP provides control services for RTP.

16. Advantages:
1.Guaranteed service delivery
2.Effectively bring together mobile and remote employees
3.free of cost

17. Dis-advantages:
• Exposure to Denial of Service attacks
• Challenging emergency calls
• Easy congestion

18. Conclusion
• Internet telephony is cost savings and
integrating new services.
• Internet Telephony is a powerful and
economical communication options by
combination of the telephone networks and
data networks.

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