According to the manual you should be able to access voicemail, and dial 2180 and leave a VM, and everyone receives it in the VM box. This is the way it worked on the old Inter-Tel system. If I go into VM, press 6 and enter 2180 I get not a valid mailbox. If I try to enter it as a direct number I get invalid on the phone screen. If I go into VM and press 8 and then 5, it only lets me enter 3 digits for a list.