Amazon has the OBi110 VoIP Telephone Adapter & Voice Service Bridge for $41 with free shipping. Still supports Google Voice and features SIP & OBiTalk VoiP services. The OBi110 includes an FXO port to connect a landline (not included in the OBi100 model).
if you already have an ooma, you can plug it into the oni110 landline port. then you can pick which line you want with a **# code or it will default to **1 whihc is the first obi110 line.
if you already have an ooma, you can plug it into the oni110 landline port. then you can pick which line you want with a **# code or it will default to **1 whihc is the first obi110 line.