Each of your analog phones should be connected to that harmonica... The first 4 (or last 4, I can't remember and will check later) are the analog trunk ports. When your provider switches your numbers to analog trunks, simply connect those trunks to the ports on the harmonica... You'll then need to choose to where those ports ring.
If you'd like, I'll try to provide step-by-step instructions for that.
Which version of AltiServ are you using (4.0, 4.5, 4.6, 5.0)?