Inter-Asterisk eXchange v2 (IAX2)
VoIP protocol developed primarily for communication between http://www.asterisk.org Asterisk servers.
XXX - Add example traffic here (as plain text or Wireshark screenshot).
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).
There are no configurable preferences for iax2.
Example capture file
XXX - Add a simple example capture file to the 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.
A complete list of IAX2 display filter fields can be found in the display filter reference
You cannot directly filter IAX2 protocols while capturing. However, if you know the UDP port used (see above), you can filter on that one.
Capture only the IAX2 traffic over the default port (4569):
udp port 4569