The FreePBX Sangoma 60 A appliance as outlined below and FreePBX Distro. In this configuration the Appliance is recommended for up to 60 extensions and 40 concurrent calls.extensions.

Specifications of the Appliance are as followed;
Table Top/1U Rack Mount
2 PCI Express Full Length Slots
3 Onboard GIG Network Ports
Single 120GB SSD drive
Quad Core Processor
4 GB of Memory
1 Year Hardware Warranty
10.5in D X 12 3/4in W X 2.75in H
Box size is 14in L X 16.6in W X 7in H and weighs 20 lbs