Thanks for your reply. No, it doesn't hang up. On every incoming call, Panasonic phone(s) ring twice, announce caller if known, and then call goes directly to GV voicemail and/or 'missed call' log. I've asked people that have called and said it rings a lot of times but I don't answer and then they hear message "unable to answer call" and hangs up and then I see on GV 'missed call' and the phone number so I can call them back if I need/want to. I don't believe that many are T-Mobile. Most calls to me are from businesses and/or family/friends that I know are not using T-Mobile.
All my incoming calls used to be answered on my answering machine, and not GV. But as mentioned, something changed a few months ago, now none of the calls get answered by answering machine, all go to GV and when I started to investigate, noticed the new specs on GV (attached pic) and more options to choose that were different from when I first set up GV. That why I thought maybe w/new specs defaulting to 'off', I needed to change some of them to off/on to avoid conflicts or something. But nothing seems to help. Should I have both devices listed as 'on'? Do 'web' and 'Obi' conflict if they are both 'on' to answer calls? (see attached pic).
Thanks again for your help. Hope this can be resolved as well as the issue on static