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Overview
IAX stands for Inter-Asterisk eXchange protocol. The IAX protocol is most commonly used to link Asterisk systems together. IAX uses a single port for call signaling and transmission of a VoIP audio stream. Where SIP uses multiple different ports for signalling and audio traffic. This single port configuration allows for easier management of securing the VoIP network. IAX default port configuration is UDP port (4569). The PBX allows configuration of IAX trunks and IAX extensions, (note that the IAX protocol for phones and endpoint devices is limited and not currently widely adopted). The IAX Settings module defines the rules that your PBX will use to establish IAX connections to other devices and servers.
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