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Knowledge Centre > 
eu-bullet.gif2. How does a VoIP call work?
eu-bullet.gif3. What are VoIP call protocols?
eu-bullet.gif4. What is H323?
eu-bullet.gif5. What is SIP?
eu-bullet.gif6. VoIP versus IP Telephony
eu-bullet.gif7. What are the key components of a VoIP network?
eu-bullet.gif8. What devices do we need to place a VoIP call?
eu-bullet.gif9. What are IP Phones?
eu-bullet.gif10. What is a VoIP Gateway?
eu-bullet.gif11. What is an ATA?
eu-bullet.gif12. What is a VoIP gateway? How about a gatekeeper?
eu-bullet.gif13. What is a SIP Proxy?
eu-bullet.gif14. What is a SIP trunk?
eu-bullet.gif15. What is a SIP URI?
eu-bullet.gif16. What is a CODEC?
eu-bullet.gif17. The benefits of using VoIP?
eu-bullet.gif18. How do I set up a simple VoIP network on an existing LAN?
eu-bullet.gif19. What is a DDI?
eu-bullet.gif20. What are PBXs?
eu-bullet.gif21. What functions does a PBX perform?
eu-bullet.gif22. What is an IP PBX?
eu-bullet.gif23. What does an ITSP do?
1. What is VoIP?
VoIP stands for Voice over Internet Protocol.  It refers to the technology used to transmit voice conversations over a data network.  

Data networks can be either the Internet or a corporate Intranet.  Calls made via VoIP are cheaper or even free. When a VoIP call is made between two branch offices via the Internet or Intranet, for example, the call will essentially be free.    Another example is when a VoIP call is made to an international destination via an Internet Telephony Service Provider, the call is routed over the Internet for most of the journey.  It will usually only return to the public telephone network (PSTN) when the call reaches the country of the destination.  In this case, the long distance toll charge is bypassed.