Renew Certificate 3CX for Windows
Ensure you’ve purchased the SSL from external party and got the CRT file. Once you got CRT file, change the name into demo.example.com-crt.pem for the cert and private key demo.example.com-key.pem and put under following folder: “C:\Program Files\3CX Phone System\Bin\nginx\conf\instance1” once done, then all you need to do just restart the nginx service that’s all