fsoz:
The only progam needed to integrate the VM is 117 (system/vm integration in PC admin). You only need to program one extension port, because one digital pair gets you 2 ports. Also, program a VTR key on needed phones. There are some optional programming steps under CO lines for auto-attendant, but don't even consider using the AA during business hours with only 2 ports, as skip555 and BTBZ pointed out. Remember, the voicemail will only do 2 things at once (ex: if 2 people are checking vm, you cannot VTR an outside caller to VM).