you can get the bin file at:
http://www.aredfox.com/edownloadsiax2.htm
This is for the AG-168V, or AG-168Q
if you have 2 rj11 jacks use the V version, if you only have 1 rj11 jack use the Q version of the firmware.
Do not use iLBC codec with firmware 1.42 it does not work, wait until version 1.43 gets released for iLBC, do not enable iLBC in the menus.
If you know of a good source for purchasing at a low price the AG-168V or AG-168Q please let me know.