Switchvoice PBXs run Switchfin open source software. Switchfin is a uClinux distribution containing lot of packages which makes practically impossible to include them all in a single PBX system.

If you are user willing to experiment/invest some time you may require certain software configuration which we don't include by default.   
At the moment you could purchase your PBX with some of the following additional components included:

• Lighttpd
• Lua scripting language and Lua Asterisk switch
• Bonjour (zero conf)
• n2n VPN
• sqlite database