August 2007
Intermediate to advanced
608 pages
20h 33m
English
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VoIP Protocols
The mechanism for carrying a VoIP connection generally involves a series of signaling transactions between the endpoints (and gateways in between), culminating into two persistent media streams (one for each direction) that carry the actual conversation. There are several protocols in existence to handle this. In this section, we will discuss some of those that are important to VoIP in general and to Asterisk specifically.
IAX (The “Inter-Asterisk eXchange” Protocol)
If you claim to be one of the folks in the know when it comes to Asterisk, your test will come when you have to pronounce the name of this protocol. It would seem that you should say “eye-ay-ex”, but this hardly rolls off the tongue very well.[102] Fortunately, the proper pronunciation is in fact “eeks.”[103] IAX is an open protocol, meaning that anyone can download and develop for it, but it is not yet a standard of any kind.[104]
It is expected that IAX2 will become an IETF protocol soon. IAX2 is currently in draft status with the IETF, and it is widely expected to become an official protocol in a few years’ time.
In Asterisk, IAX is supported by the chan_iax2.so module.
History
The IAX protocol was developed by Digium for the purpose of communicating with other Asterisk servers (hence the Inter-Asterisk eXchange protocol). It is very important to note that IAX is not at all limited to Asterisk. The standard is open for anyone to use, and it is supported by many other open source telecom projects, as well ...
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