The document presents information about IP Telephony. It discusses that IP Telephony uses the Internet protocol to send audio, video and data in real-time between users. The H.323 standard is introduced for transmitting real-time communications over packet networks based on IP telephony. H.323 includes terminals, gateways, gatekeepers and multipoint control units. The document then explains the H.323 call establishment process and components involved.

1. Presented By:Kundan Kumar Pandey
Enroll :-100860116022
B.E. 3rd Year(I.T.)
IP Telephony
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INTRODUCTION
DIFFERENT TYPES
WHAT IS H.323
H.323 COMPONENTS
H.323 CALL ESTABLISHMENT
H.323 CONTROL SIGNALING FLOW
H.323 MEDIA STREAM & MEDIA
CONTROL FLOW
H.323 CALL RELEASE
CONCLUSION
IP Telephony
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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 of voice and data
networks, services, and applications.
The main motivation of development of IP
Telephony is the cost saving & integrating new
services.
IP Telephony
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Vocaltec introduced the first Internet telephony
software product in early 1995. Running a
multimedia PC, the Vocaltec Internet Phone.
In 1996, Vocaltec with an Intel Company announced
to produce the first IP telephony gateway.
IP Telephony
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PC to PC
Phone-to-phone over IP
PC-to-Phone
Phone-to-PC
IP Telephony
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The H.323 standard for the transmission of real-time
audio, video, and data communications over packetbased networks based on IP telephony.
H.323 is a standard produced by the ITU-T Study
Group 16.
Currently the most widely-supported IP telephony
signaling protocol.
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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.
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Gateways :
An H.323 gateway provides connectivity
between an H.323 network and a nonH.323 network.
IP Telephony
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Address Translation
Admission Control
Bandwidth Control
Zone Management
Call-Control Signaling
Call Authorization
Call Management
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MCUs provide support for conferences of three or
more H.323 terminals. All terminals participating in
the conference establish a connection with the MCU.
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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.
Many public telecommunication operators are
establishing their own IP telephony services, and
using IP-based networks as alternative transmission
platforms.
IP Telephony
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IP Telephony
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