The full monty. The Abcom PBX in the cloud for 1 to 3 extensions is included with your extension monthly fee.  Please order this product if you forsee up to 3 extensions for your business so that we may size your server accordingly. 1 to 3 extensions will be provisioned on a shared services PBX. As you business grows, we will move you to a larger dedicated server as the need arises. No worries, you keep your phone number.