asterisk users - Oct 2006 - Cubix / Firefly softphone and Asterisk

Hi All

Has anyone used Cubix / Firefly successfully with Asterisk?  When 
someone calls a Cubix softphone, Cubix never seems to answer the call 
correctly.  The other person just hears ringing even though it has been 
answered.  I am using IAX as the SIP support doesn't seem to 100% 
either.  Idefisk works 100% on the same setup.

Kind Regards
Garth