>So you can create a text file and the app will convert it to a voice file and send it out?
>
>You could do that using the Festival text-to-speech option, but IMHO it sounds a bit robotic: http://festvox.org/voicedemos.html . Cepstral sounds better- visit http://www.cepstral.com/demos/ to try it out. They'll sting you a couple of thousand $ if you want 64 ports operating at once though if it's the same message I suppose you could write a script to create a result you can send repeatedly. The alternative is to dial a specified number and record the message you want sent, after which you can send it off with voicemail blaster.

The voice on that is pretty bad. AT&T has a much better text to voice system. You can test the demo at http://www.research.att.com/~ttsweb/tts/demo.php