Ip telephony ppt
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Transcript of Ip telephony ppt
A TECHNICAL SEMINAR ON IP TELEPHONYIP TELEPHONY BY JAISHANKAR KUMAR (1201214265)(1201214265) ELECTRONICS & TELECOMMUNICATION ENGINEERING
KIST
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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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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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.
Protocols Specified by H.323 :
• real-time transfer protocol (RTP)
• real-time control protocol (RTCP)
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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.
Advantages:
1.Guaranteed service delivery
2.Effectively bring together mobile and remote employees
3.free of cost
Dis-advantages:• Exposure to Denial of Service attacks
• Challenging emergency calls
• Easy congestion
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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