In the process of the development of Asterisk a new protocol has gathered
the attention among the VoIP users - the Inter-Asterisk eXchange, or IAX
(TM), Protocol, used as a the native communication protocol between
Asterisk PBX Servers. What is particularly good in it is that it requires
only one UDP port per endpoint to create a successful communication channel
for VoIP calls. This makes it much friendlier for users behind NAT, which
is not the case with SIP and H.323 - they required specific router
configurations for their channel establishment, thus hindering faster
spread of VoIP on the home and corporate desktop.
