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here you can get som basic idea about VoIP like what is VoIP, how it works, PSTN vs. VoIP, application etc . . .

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  1. 1. VoIP
  2. 2. What is VoIP? VoIP [Voice over Internet Protocol] is family of communication protocols and transmission technique which is used in delivery of voice communication or multimedia sessions over internet.
  3. 3. How VoIP works? <ul><li>VoIP protocols first converts your voice or media into digital signal and travels over the internet. At receiver side it decode in its original format. </li></ul><ul><li>VoIP allows you to make a call from your desktops/laptops or from IP phones using internet. You can make a call from your traditional telephones using spceial type of phone adapter. </li></ul>
  4. 4. How VoIP works?
  5. 5. VoIP Protocols <ul><li>Some proprietary and open-source protocols : </li></ul><ul><li>H.323 </li></ul><ul><li>IMS [IP Multimedia System] </li></ul><ul><li>MGCP [Media Gateway Control Protocol] </li></ul><ul><li>SIP [Session Initiation Protocol] </li></ul><ul><li>RTP [Real-time Transport protocol] </li></ul><ul><li>SDP [Session Description Protocol] </li></ul><ul><li>IAX [Inter-Asterisk eXchange] </li></ul>
  6. 6. What is PSTN? <ul><li>PSTN [Public Switched Telephone Network] is the network of circuit-switched telephone network which is based on telephone lines, fibre optics, celluler networks, communication satelites etc. </li></ul><ul><li>It is our conventional method of voice communication which is based on circuit switching which are now replaced by VoIP technique. </li></ul>
  7. 7. VoIP vs. PSTN <ul><li>Carrier Lines </li></ul><ul><li>PSTN : Dedicated lines required from telecom company </li></ul><ul><li>VoIP : Only an internet connection is required </li></ul><ul><li>Bandwidth </li></ul><ul><li>PSTN : Each telephone lines require 64kbps in each direction </li></ul><ul><li>VoIP : Using compression, VoIP can use only 10kbps in each direction </li></ul><ul><li>Features </li></ul><ul><li>PSTN : call waiting, call conference, caller ID available at an extra cost </li></ul><ul><li>VoIP : all features are generally free </li></ul>
  8. 8. Continue . . . <ul><li>Upgrade and Expansion </li></ul><ul><li>PSTN : Very complex due to change in hardware and wires </li></ul><ul><li>VoIP : Sometimes just require more bandwidth and software upgrade </li></ul><ul><li>Rental </li></ul><ul><li>PSTN : Expensive compare to VoIP </li></ul><ul><li>VoIP : About 1/4 times less expensive to PSTN </li></ul><ul><li>Remote PABX extension </li></ul><ul><li>PSTN : Very costly and require each dedicated line for each </li></ul><ul><li>VoIP : It is a standard feature of VoIP </li></ul>
  9. 9. Application <ul><li>Some application that you used in your daily life is based on VoIP. </li></ul><ul><li>Like Skype, Gtalk, Yahoo Messenger, Fring, E-buddy, Nimbuzz, Twinkle, Brosix, SIPSet, Gizmo, iChat, iCall that are used on various platform like Windows, Linux, MAC OS X, Android and many mobile platforms. </li></ul>
  10. 10. Some Application
  11. 11. Advantages of VoIP <ul><li>Cost is very less compare to conventional telephone lines </li></ul><ul><li>Upgrading and maintenance is easy </li></ul><ul><li>PC-PC free calls and PC-Mobile/Landline nominal charge </li></ul><ul><li>You can obtain concurrent data, voice and video calls </li></ul><ul><li>Very less hardware requires because is use the internet connection </li></ul><ul><li>Portability is achieved if you are using Wi-fi or wireless connection </li></ul><ul><li>Call waiting, caller ID, call conference are free </li></ul>
  12. 12. VoIP Devices [1] ATA: Most useful device for VoIP is ATA(Analog telephone Adaptor). It helps you to connect your standard phone to computer and lets you call.
  13. 13. Continue [2] Computer-to-computer : Its the easiest way to make VoIP calls. You just need to have a software, microphone, speaker and sound card (and internet connection obviously ! ! !). There are not any additional charges for this.
  14. 14. Continue [3] IP Phone : This look like just a simple phone with the headset and different buttons. IP Phones connect directly to your router and contain all the necessary software and hardware to handle the IP calls.
  15. 15. Extra Information <ul><li>List of websites that works on VoIP </li></ul><ul><li>Www.evaphone.com </li></ul><ul><li>Www.voipbuster.com </li></ul><ul><li>Www.freeipcall.com </li></ul><ul><li>Www.s-unno.com </li></ul><ul><li>Or you can create your own VoIP server using AsteriskNow operating system or some software </li></ul>