i will second this, i have been using sipgate since 2007
I will add I am using sipgate on a Polycom VVX 601 and on Groundwire, I started with the app first, but was given a physical phone so use both.
The physical phone is useful in my case as I sometimes have guests that don't have mobiles, so I just have a dedicated spare number added so if anyone needs them they can share that number and the rest of the time it is do not disturbed.
Not exactly short on line capacity with a VVX 601
Many Thanks,
RR-THE-IT-GUY
Virgin Media M500
Talktalk 2014-2018 →
Virgin Media Vivid 50 2018-2019 →
Virgin Media M100 2020-05/2022 →
Virgin Media M500