If it is really important, then buy a cheap PC and keep it in phone room and use serial connection, then PCANywhere across the LAN.
As a side note, you can use this same machine as a jukebox for the music on hold. Keep a library of MP3's on it and then connect the line out to the music on hold port. Using WINAMP, you can cycle through a set of music and change it using the the PCAnywhere connection.
Tim