IAX Last modified: Friday, November 16, 2007
Short for Inter-Asterisk eXchange, IAX is the native Asterisk PBX protocol and is now supported by many VoIP platforms. It has a number of advantages over SIP including bandwidth efficiency, it uses a single UDP port, 4569, so it slides through NAT with ease, and since it is a binary protocol, it is more difficult to attack. Despite these advantages IAX is not supported as widely as SIP, and it also puts a heavier load on your server because all traffic must pass through the server. See Asterisk. See also "VoIPowering Your Office: Defeat the Pesky NATs of VoIP With IAX" on VoIPPlanet.com.
•E-mail this definition to a colleague• For internet.com pages about IAX . Also check out the following links! Enterprise VoIP Planet  The IT Manager's Guide to Voice over IP IAX protocol simplifies VoIP  After Mark Spencer created Asterisk, the open source PBX, he started to see how this lack of simplicity could be a huge barrier to the VoIP market. In response, he created a new protocol called IAX. VoIPowering Your Office: Defeat the Pesky NATs of VoIP With IAX  If you must support SIP there are a number of ways to get around nasty NAT problems: SIP proxies, STUN (Simple Traversal of UDP through NAT) servers, and majick routers. Or you might consider avoiding SIP entirely and use IAX (Inter-Asterisk Exchange) instead.	Internet Protocols Internet Telephony asterisk binary PBX Session Initiated Protocol UDP VoIP Give Us Your Feedback Shopping IAX Products Compare Products,Prices and Stores Shop by Category: Laptop Accessories 0 Store Offers UPS Systems Devices 1 Model Matches Personal Care 1 Store Offers Building Supplies 1 Store Offers