What is IAX trunk?

IAX trunking allows multiple voice streams to share a single “trunk” to another server, reducing overhead created by IP packets. IAX always sends the DTMF outline (RFC2833), eliminating the confusion often found with SIP.

What is difference between SIP and IAX?

The main difference between SIP and IAX is that IAX is a lot more efficient when utilizing bandwidth compared to SIP. Given a specific bandwidth, using IAX lets you carry a greater number of concurrent phone calls than if you used SIP. IAX achieves this by being a binary protocol and not a plain-text protocol like SIP.

What is IAX UDP?

IAX is a VoIP protocol that can be used for any type of streaming media including video, but is mainly designed for IP voice calls. IAX uses a single User Datagram Protocol (UDP) data stream between endpoints for both the session signaling and the media payloads. IAX is a binary-encoded protocol.

Which is better to use SIP or Iax?

SIP is a plain-text protocol, and hence uses comparatively more bandwidth then IAX. IAX is a binary protocol, which allows it to use less bandwidth. IAX is a lot more efficient when utilizing bandwidth compared to SIP, while given a specific bandwidth, by using IAX you can carry a greater number of concurrent phone calls than if you used SIP.

Are there any IAX2 trunks for Asterisk servers?

Finally, within recent releases of Asterisk there is a simple to use built-in AES128 based encryption for IAX2 trunks. This encryption seems most appropriate for trunking between Asterisk servers. It is not known to be supported by any IAX2 end-point devices. Some details about this can be found on http://www.voip-info.org

Can you pass Iax from one server to another?

In fact, given that the servers can qualify each other periodically, quite often you can pass IAX across a router without even opening up a port. The two servers will connect to each other and keep the connections alive automatically. If you do need to forward a port it’s only one port, not matter how many calls you pass across the IAX trunk.

What is IAX2 and why does it matter to me?

IAX2 is a wholly Asterisk specific phenomenon. As such its scope is limited, having essentially no application beyond Asterisk installations. Carriers may be migrating into SIP and further onward to IMS, but that has little bearing on IAX2. Nor does it keep IAX2 from providing a solution to situations faced by typical Asterisk users every day.

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