[Asterisk-Users] gsm cannot be found in any file form... but it's there

[Scheda]

Hey, I recorded this intro, and changed it to a gsm file in the shell,
and I'm getting an error saying that it isn't in the directory at all
when it's sitting right there. I don't know why that is.

If you want to hear it, it's http://scheda.underfireradio.com/astintro.mp3

I don't know what the matter is, I've tried renaming it, copy and
pasting it in there, deleting it and placing it back... I'm kinda out
of ideas.