Dinstar DWG2000C-4/8G is a multifunctional VoIP / GSM gateway that operates on IP and GSM networks, which provides flexible network configurations, extensive features and good sound quality.
Orpheum offers its iVoice (SIP trunking) and hPBX (Hosted/Virtual PBX) services exclusively to businesses in the USA and Canada. Both services start at $25 per month.