I just signed up for voicemail from eVoice 'cause I need a number for a few weeks, and I was dismayed to discover that not only do they have a proprietary audio format, but they don't have a Mac player -- instead you have to write in and ask 'em to change something.

So instead, I installed sox and fiddled around for a while, and discovered that the files are GSM format (whatever that is.) So to convert 'em from .evc to .wav, the command is simply sox -t gsm foo.evc foo.wav.

Getting sox installed is up to you; I used pkgsrc to get it working on MacOS X, but I'm weird that way.

those three chimes again!
you know this number by heart,
oh heartless device!
you used to dial it without fail
when I was sleeping with her.

but now that all I want is dinner
and all she wants is some obscure favor,
three chimes signify
you won't even try to place the call.