The OBi200 features a single phone port and single Ethernet connection to the Internet. It provides much of the same call control / call routing functionality of the OBi202 including support for the OBiWiFi and OBiBT USB accessories, 4 VoIP services (SIP), OBiTALK and T.38 fax - when connected to a service provider who also supports the T.38 protocol. At just under 70mm square and 27mm high, the OBi200 is arguably the smallest, most powerful VoIP device available today.