need help finding voice modem

From: Joe (joe_at_nospam.com)
Date: 11/28/04 

Date: Sun, 28 Nov 2004 21:13:51 GMT

I need to find a basic rs232 voice modem for a proof of concept device.
  The final product will have the functionality built in but for now I
need an external solution.

The application will generate DTMF codes, and send a voice message. The
modem needs basic hayes commands, enough to go off hook and dial out,
send a message and hang up or hold the line open. ARM9 processor
running a uLinux distro.

Any help would be appreciated.

Joe