The handset we suggest first, the Fanvil H2U, is sold by Fanvil as a hotel phone. It sits in guest rooms, hospitals, and schools, in buildings where somebody has to maintain hundreds of them and cannot afford for any of them to be fussy. That is not a consumer device with a family-friendly sticker on it. It is commercial equipment that happens to suit a kitchen very well.
What that buys you is unglamorous and real: HD voice with the G.722 and Opus codecs, a full-duplex speakerphone, dual Ethernet with PC bypass, PoE, VLAN and QoS support, 802.1x, and TR-069 provisioning — which is the mechanism that lets the phone configure itself from us with no cable, no admin password, and nothing for a child to wander into.
Ten physical speed-dial buttons, no screen, no menu. The protection is inherent in the hardware rather than a setting somebody has to remember to switch on.
Buy it from any VoIP reseller. We do not sell handsets and earn nothing on them. Ooma’s Telo is $69.99 and the H2U lands in similar territory, so the hardware is close to a wash — the difference is what kind of device you end up with.