VOIP and ATA for domestic calling in the UK

Not located in the UK but have tried Cisco, Poly, and Audiocodes ATA's for a major University in the U.S. The experience was quite troubling if I'm being honest. Deployment is one thing but stability is another. The easiest deployment out of the 3 for me was the Poly ATA302 which is now End of Life. I suggest you look for a ATA that supports Zero Touch Provisioning (ZTP) like the newer Poly ATA's, Grandstream or Cisco. Audiocodes ATA's do work with Zoom phone however, they do not support ZTP.