Cannot change enabled codecs in IAX settings

This is still the case in 2.10 RC1.

Here is a workaround that edits the database directly.

mysql --database=asterisk --host=localhost --user=freepbxuser --password=(the database user password)

-- set the G.722 codec to be the first priority codec
update iaxsettings set data=1 where keyword='g722';

-- the default IAX codec order is: ulaw 1, alaw 2, gsm 3
--   update the priorities of these three codecs to move each down by one priority level
update iaxsettings set data=2 where keyword='ulaw';
update iaxsettings set data=3 where keyword='alaw';
update iaxsettings set data=4 where keyword='gsm';

\q

Then change any other setting temporarily in the FreePBX web interface and click "Apply Config" to regenerate the configuration files.

FYI, the fix is at http://www.freepbx.org/trac/ticket/5560

dup of #5560