2. PRESENTED BY: PRIYANKA SINGH BRANCH:ETC REG NO.050122034

3. VoIP’s Outlines Introduction How it works Connection Security Issues Drawbacks Requirements Working of voip

4. WHAT IS VOIP? Voice over IP is the technology of digitizing sound, compressing it, breaking it up into data packets,and sending it over an IP(internet protocol) network where it is reassembled, decompressed,and converted back into an analog wave form. VoIP is a technology that allows you to make voice calls using broadband internet connection instead of traditional phone line.

5.  Simply the Future replacement of PSTN (public switched telephone network).  Voice over Internet Protocol is the transport of voice over IP based data networks like WAN, MAN and LAN.  Many vendors and technology organizations are involved in VoIP Technology such as Cisco, VocalTec, 3Com, Microsoft, USRobotics and NetSpeak.

6. VOIP INFRASTRUCTURE

7. REQUIREMENTS OF VOIP EQUIPMENTS REQUIRED: A broadband (high speed Internet) connection is required. A computer, adaptor, or specialized phone is required. Sound card,speakers.

8. SOFTWARE REQUIREMENTS Voice Processing Module - to prepare voice samples for transmission. A PCM Interface – to receive samples from the telephony interface(eg.voice card) and forward them to VoIP software for further processing. Idle Noise Detection – to supress packet transmission on the network when there no voice signals to be sent.

9. Call Signaling Module – to serve as a signaling gateway which allows calls to be estabilished. The Packet Voice Protocol – to encapsulate compessed voice and fax data for transmission over the network.

10. HARDWARE REQUIREMENTS Media/VOIP Gateways(gateways ) They are used for call admission and control and also for bandwidth management. Create VoIP packets from analogue voice signal using CODECs.  IP NETWORK  The IP network connects the, often distributed, elements of a VoIP network. As VoIP traffic is sensitive to delay, Quality of Service must be maintained.

11.  Full Duplex Voice Cards which allow both communicating parties to speak at the same time - as often happens in reality.

12. WORKING OF VOIP VoIP services convert your voice into a digital signal that travels over the Internet. If you are calling a regular phone number, the signal is converted to a regular telephone signal before it reaches the destination.

14. WAYS OF MAKING VOIP CONNECTION The three ways are:  COMPUTER TO COMPUTER This mode is the most common, as it is so easy and free. You need to have a computer connected to the Internet, with the necessary hardware to speak and listen (either a headset or speakers and a microphone).You can install voice communication software like Skype and you are ready to talk.

16. PHONE TO PHONE This mode is very handy. It implies using a phone set on each end to communicate. There are two ways in which you can use phones to make VoIP calls: Using IP Phones Using an ATA

18. PHONE TO COMPUTER AND VICE VERSA

19. SECURITY THREATS IN VOIP  Identity and service theft  Vishing  Call tampering

20. ADVANTAGES  Voice and Data Integration  Fault tolerant design  Network Efficiency  Cost reduction  Data integrity

21. DISADVANTAGES AND IMPLEMENTATION CHALLENGES  The quality and overall reliability of the phone connection is entirely reliant upon the quality, reliability, and speed of the internet connection.  Emergency calls, cannot easily be routed to a nearby call center, and are impossible on some VoIP systems.

22. CONCLUSION  VoIP is one of the most happening sectors of telecommunication technologies where people can send voice and data at relatively cheap rates. Considering the applications and economic benefits of the technology, and the fact that more companies are joining the VoIP bandwagon with their own neat little applications, it may be expected that the future belongs to VoIP.