An other solution that I'm currently testing is: GVsip, one of the newer services.
GVsip states: "GVsip - Enhance Google Voice
GVsip is a free cloud based service that connects you to Google Voice and turbo charges its capabilities."
https://www.gvsip.com/ GVsip, appears to be operated by the same folks that operate Vestalink.
It can be use Free for up to 1,000 minutes per month.
The advantage over Simonics is that GVsip allows the User to import, build and add to a Phone Contact List that is used for CNAM.
So far, the experience has been a good one but at this point, I'm only using GVsip for a seldom used, except for testing V-Office phone number.