1 / 16

How VoIP Works: A Guide to Internet Phone Calls

Learn how VoIP works and why it is useful for making phone calls over the internet. Discover the different types of VoIP services and popular products like Skype, D-Link, and Linksys.

biler
Download Presentation

How VoIP Works: A Guide to Internet Phone Calls

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. How VoIP Works VoIP, or Voice over Internet Protocol, is a method for taking analog audio signals and turning them into digital data that can be transmitted over the Internet. How is this useful? VoIP uses a standard Internet connection to place phone calls. By using some of the free VoIP software that is available to make Internet phone calls, you are bypassing the phone company (and its charges) entirely. From: http://electronics.howstuffworks.com/ip-telephony.htm

  2. The Standard Phone System vs. The VoIP System – i.e. Circuit vs. Packet Switching Circuit Switching Existing phone systems are driven by a very reliable but somewhat inefficient method for connecting calls called circuit switching.Circuit switching is a very basic concept that has been used by telephone networks for more than 100 years. When a call is made between two parties, the connection is maintained for the duration of the call. Because you are connecting two points in both directions, the connection is called a circuit. This is the foundation of the Public Switched Telephone Network (PSTN).

  3. IP Telephony – Circuit Switching

  4. The Standard Phone System vs. The VoIP System – i.e. Circuit vs. Packet Switching Packet SwitchingData networks do not use circuit switching. Your Internet connection would be a lot slower if it maintained a constant connection to the Web Page you were viewing at any given time. Instead, data networks simply send and retrieve data as you need it. And, instead of routing the data over a dedicated line, the data packets flow through a chaotic network along thousands of possible paths. This is called packet switching.

  5. IP Telephony – Packet Switching

  6. “Flavors” of VoIP service • ATA – analog telephone adaptor – or analog-to-digital converter • Connects a standard phone to your computer or your Internet connection • Providers: e.g. Vonage and AT&T CallVantage • IP Phones – Specialized phones with an RJ-45 Ethernet connector • IP phones connect directly to your router and have the hardware and software necessary to handle the IP call. • Soon, Wi-Fi IP phones will be available make VoIP calls from any Wi-Fi hot spot. • Computer-to-computer – • All you need is the software, a microphone, speakers, a sound card and an Internet connection,

  7. VoIP Products Tested • Skype – with • PC to PC • D-Link • Linksys “Cordless Internet Telephone Kit”

  8. Skype What is Skype? • Skype is a little piece of software that lets you make free calls to anyone else on Skype, anywhere in the world. • Also, until the end of 2006, you can make free calls to landlines and mobiles in the US and Canada from Skype. • If you and your friends, family or business contacts are using webcams, you can also make free video calls. • You can even call landlines and mobile phones at really cheap per minute rates (and there’s no setup or subscription fee).

  9. Skype Skype works on most kinds of computers • Windows • Mac OS X • Linux • Pocket PCs. Supports calls, chats and file transfers Prerequisites: Software, microphone, speakers, sound card and an Internet connection

  10. Skype SkypeOut

  11. Skype SkypeIn: • Get your own phone number for Skype. Family, friends and business contacts can call you from traditional phones, and you pick up the call in Skype. Skype Voicemail: • If you’re offline in Skype, too busy or just plain don't feel like talking to anyone right now, let Skype Voicemail pick up the call instead.

  12. DPH-50U  >  Skype™ USB Phone Adapter Product Features: • Receive/make both regular telephone and Skype calls on the same phone • In-call switching, conference calling, call forwarding, and toll bypassing • Use Skype™ to talk to other Skype users anywhere in the world.

  13. Dlink DPH-50U Diagram

  14. Linksys Cordless Internet Telephony Kit - CIT200 Skype with Handset Convenience! • You don't have to sit in front of your computer to talk to your friends with Skype™ • USB Base Station connects to your PC and puts your Skype contact list on the handset's screen -- just choose and talk • Handset features illuminated Caller ID screen, speakerphone and call waiting • Also supports SkypeOut dialing™ incoming SkypeIn™ calls and Skype VoiceMail

  15. VoIP Products Summaryhttp://electronics.howstuffworks.com/ip-telephony.htm Skype • PC to PC • D-Link • Linksys “Cordless Internet Telephone Kit” Note: The Forrester Research Group predicts that nearly 5 million U.S. households will have VoIP phone service by the end of 2006. Perhaps the biggest draws to VoIP for the home users that are making the switch are price and flexibility.

More Related