Unless you're an adventurous VoIP tinkerer, there is no easy do-it-yourself approach to getting Google Voice to work over an IP phone's unused line. Obihai Technologies series of Obi telephone adaptors allow you to easily use a basic analog phone with Google Voice, but some contortion is required to use an Obi with an IP phone, and even then it may not work. You can follow our guide to rigging an OBi together with Cisco SPA-series IP phones (or Polycom phones as Voxilla member "Priller" … [Read more...]