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Knowledge Centre > 
eu-bullet.gifKnowledge Centre
eu-bullet.gif1. What is VoIP?
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?

13. What is a SIP Proxy?

 
SIP proxies are elements that route SIP requests to user agent servers and SIP responses to user agent clients.  A request may traverse several proxies on its way to a UAS.  Each will make routing decisions, modifying the request before forwarding it to the next element.  Responses will route through the same set of proxies traversed by the request in the reverse order.
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