I was able to provision a Yealink T41P back in September but when I add the provisioning URL to the phone's GUI or use the SBC the T41P handsets don't seem to do anything. I've loaded the latest supported 3CX firmware.
Yup, that's my understanding as well.
Not happy about it, but it is what it is. My happiness is not a design requirement
You could set up your own provisioning server.
Just wanted to add in case anyone else is reading this and having difficulty provisioning older handsets like T41P.
I managed to get the T41P handsets to provision by disabling SSL/SecureSIP Transport and Ciphers (under Security > Anti-Hacking). Obviously re-enable this provisioned.