My -almost finished now- teaser of a text adventure also uses a phone ringing sound. I picked it from http://www.freesound.org/
(a nice repository of freely usable audio snippets of all kinds) and converted it to iff with Goldwave
, a windows audio editor which supports saving in Amiga standard iff 8vsx format. Don't know what .sam format exactly is, though.
Great games, by the way!!