با سلام
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You need to get that file, unzip it, unzip the zip inside it (It all unzips into the current directory, so you'd best put it somewhere on it's own first) and you'll get a series of c & header files. If you're using Linux (and the rest of this assumes you are) cp makefile.gcc Makefile and make it. xa.bi's site (Where I found the decoder existed) says you should do some playing with the files, but I've no idea what difference it makes. His site, btw, contains a much more advanced AMR converter than this, but I didn't need that kind of complexity. Put the resulting executables (encode and decode) somewhere useful, and remember where it is.
یا علی