ring-u
ring-u Hello Hub Small Business Phone System (PBX) and Service (VOIP). Up to 30 Lines and 75 Extensions. Keep Your Number! Set-up Easier Than a Wireless Router. Ring-u Service Required.
Excelltel
Excelltel PABX SOHO-PBX Phone Exchange SP-416CS+ (4 CO x 16 Extensions) Telephone Switch System Control
Grandstream
Grandstream UCM6202 IP PBX- 2 Port