I apologize if I am asking a rudimentary question, but I have done some searches here and have not found success. I am putting together my first 3CX system to give it a test drive for to replace our aging fonality system. I have some spare Polycom phones, and am trying to get them registered with the 3CX server. I have created an option 66 entry in out DHCP server that points to the 3CX server http://172.16.2.40:5000/provisioning/b6obm03lfu I reset the phone to factory. The REV listed when I press about is 4.1.1.0232 I have created and extension to use the Polycom SPIP550 (4.x.x) When the phone boots, it says "Error, application is not present!" I have downloaded the Polycom 4.1.1 Zip file, but I am not sure where to extract it to. The way I read it in some of the posts here, the contents should go into C:\ProgramData\3CX\Data\Http\Interface\provisioning\b6obm03lfu, but that seems messy to me. If I try that, the phone says ....2345-125001-001.sip.ld is not compatible... THat makes me think it is the right folder, but the firmware is wrong or something. Can anyone help me? I really am excited to get this system up and tested!