I found the general info page: https://www.3cx.com/sip-phones/ but what exactly does compatibility mean? Are these phones able to use the 3cx specific tunnel? The reason I am asking is that I am planning to host my own 3cx pabx in the cloud and am looking at compatible phones to use in our offices. The mobile clients and softphones seem to use this tunnel so that's already quite secure and now I was wondering about the desk phones. I'd appreciate any info or pointers to go read up on this issue. I know I can set up a SBC to use the tunnel. Just trying to figure out if any phones do this directly.