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# Inter-Asterisk eXchange v2 (IAX2)
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VoIP protocol developed primarily for communication between <http://www.asterisk.org> Asterisk servers.
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## History
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XXX -
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## Protocol dependencies
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- [UDP](/UDP): Typically, IAX2 uses [UDP](/UDP) as its transport protocol. The well known UDP port for IAX2 traffic is 4569.
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## Example traffic
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XXX - Add example traffic here (as plain text or Wireshark screenshot).
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## Wireshark
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The IAX2 dissector is fully functional for non-trunked packets. Separate calls are identified and tracked, and provided the start of a call is captured, the payload is passed to subdissectors. Recent versions of wireshark also include logic to calculate how "late" a packet is relative to its timestamp. Trunked packets show only their type (3 - meta packet).
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## Preference Settings
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There are no configurable preferences for iax2.
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## Example capture file
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XXX - Add a simple example capture file to the [SampleCaptures](/SampleCaptures) page and link from here (see below). Keep this file short, it's also a good idea to gzip it to make it even smaller, as Wireshark can open gzipped files automatically.
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- [SampleCaptures/IAX2\_incoming\_call.acp](uploads/__moin_import__/attachments/SampleCaptures/IAX2_incoming_call.acp)
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## Display Filter
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A complete list of IAX2 display filter fields can be found in the [display filter reference](http://www.wireshark.org/docs/dfref/i/iax2.html)
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## Capture Filter
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You cannot directly filter IAX2 protocols while capturing. However, if you know the [UDP](/UDP) port used (see above), you can filter on that one.
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Capture only the IAX2 traffic over the default port (4569):
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```
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udp port 4569
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```
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## External links
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- [RFC 5456 - IAX protocol specification](http://tools.ietf.org/html/rfc5456)
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- [voip-info.org wiki page](http://www.voip-info.org/wiki/view/IAX)
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- [IAX vs SIP](http://www.en.voipforo.com/IAX/IAXvsSIP.php)
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## Discussion
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---
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Imported from https://wiki.wireshark.org/IAX2 on 2020-08-11 23:14:55 UTC |
