IP Telephony (VoIP)
Introduction (1)
• Challenge
– Voice transmission delay
– Call setup: call establishment, call termination, etc.
– Backward compatibility with existing PSTN (Public Switched Telephone Network)
– IP Telephony Standards:
– ITU (International Telecommunication Union) controls telephony standards.
– IETF (Internet Engineering Task Force) controls TCP/IP standards.
Encoding, Transmission, & Playback (1)
• UDP is used for transport because
– lower overhead: audio must ....etc

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This article is presented by:Aditya Dua ([email protected])
Aman Kansal ([email protected])
Arjunan R ([email protected])
Sumitra Ganesh ([email protected])
Vivek Raghunathan ([email protected]))
ABSTRACT
Air passengers are required by the law to switch off their mobile phones on board any flight .This requirement has been imposed due to two reasons. First, signals emitted by the mobile phone interfere with Air Traffic ....etc

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Telephony: history and evolution
IP Telephony: What, Why & Where?
q Adding interactive multimedia to the web
q Being able to do telephony on IP with a variety of devices
q Consumer & business markets
q Key element of convergence in carrier infrastructure
Basic IP telephony model
q Protocols: SIP, H.323, RTP, Coding schemes, Megaco
q Future: Invisible IP telephony and control of appliances
What is VoIP?
Why VoIP?
Where is VoIP Today?
What is VoIP?
q Telephony over IP standards bodies
q I ....etc

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ADVANCED NOISE REDUCTION FOR MOBILE TELEPHONY

INTRODUCTION
¢ Have you ever used your mobile phone to place a call from a noisy place and been asked to call back from someplace quieter

¢ It would be great if the phone would mute the background noise for you
¢ This can be done by advanced multi microphone noise suppression algorithm working with principle of human hearing system.

EFFECT OF NOISE
If the environment is noisy
It will enter into microphone so that it become difficult for the ....etc

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In modern days,using various high-tech machineries and equipments to get our jobs done and make the life easier. These machineries should be controlled by the home-owner from any location as the homeowner might be away from home at workplace or traveling in a different place in the weekend. Thus a system of remote monitoring and controlling are very
much necessary. Smart home is one of these types of system equipped with home appliances which we wish to control smartly from anywhere ....etc

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i want audio captcha existing solution assesment and implementation over voip telephony synopsis and seminar report ....etc

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i want to give seminar on that topic.so i want abstract of internet telephony policy in india ....etc

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i want ieee paper of audio captcha existing solutions assessment and a new implementation for voip telephony ....etc

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1). Introduction:
This document explains about VoIP systems. Recent happenings like Internet diffusion at low cost, new integration of dedicated voice compression processors have changed common user requirements allowing VoIP standards to diffuse. This how to tries to define some basic lines of VoIP architecture.
What is VoIP?
VoIP stands for ' Vâ„¢oice Ëœoâ„¢ver ËœIâ„¢nternet ËœPâ„¢rotocol. As the term says VoIP tries to let go voice (mainly human) through IP packets and, in d ....etc

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FROM
prashanth v.r
mangalore

1.weather this topic has been implemented or not.... how much it costs....

....etc

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