Inspector (for lack of a better name) is a Asterisk CDR inspector
IaxDissect is a Inter-Asterisk Exchange protocol dissector. It is not a replacement for Ethereal but it gets the job done on boxes where you can't install fink or darwinports.
New in version 1.3: save and load pcap format captures.
Note: you have to authorize the application when starting and stopping a capture as it needs superuser rights to open the first network device in promiscous mode. You can only use the first network device (en0/bpf0) to capture.
Bugs: there probably are. You will experience weird application behavior if you start more than one capture at a time.
Cocoa Iax Ping
This is a cocoa port of the file below. It basically sends a IAX ping message (a POKE packet) to the Asterisk server. If you get a reply, your firewall is correctly configured. License: BSD.
Iax Ping (command line tool)
The command line version. Should compile on any *nix system (use g++ or fix the source for Ansi C). The binary is built for Mac OS X. License: BSD.