playback audio message down phone line

From: Paul Dixon (paul_at_elphin.com)
Date: 09/30/03 

Date: 30 Sep 2003 02:06:12 -0700

I want to have a server initiate a telephone call to a voicemail
service, playback a wav file, and hang up.

I've googled for information on how to do this, but come up empty
handed. Does anyone have any pointers on how might achieve this, e.g.
suitable modem, any existing software etc?

This is so my support team can be woken in the middle of the night by
a Stephen Hawking-like voice telling them about a critical failure.
Who wouldn't be thrilled to recieve such a call :-)

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