[Freeswitch-users] Country specific tones - how to contribute?

I have tracked down a set of au tones from the mailing list, which I am going to verify. How do I go about getting these added into the default build so that they are available for all in future? I tried <action application="set" data="ringback=${au-ring}"/> and this did not work - where does it try and load the ring tone from? I have entries in the tones.conf file, but these do not seem to be used. Scott