Probably not what you want to hear but I would recommend changing the One-x to a Linux App Server installation.
Then once you have a certificate it can be added to the app server by
Adding the SSL Certificate to the Server Edition/App Server
(This is based on a wildcard cert we use of *.voice.company.cloud
Extract the Zip file to a location on your PC. There will be 5 files.
Log in to the Server Edition with IP Office Manager and switch to Security Settings
Navigate to System>Certificates.
Under Trusted Certificate Store, Click "Add" and browse to the location where you unzipped the files earlier. Select the Intermediate.cer file
Under Identity Certificate, ensure that Offer ID Certificate Chain checkbox is ticked and then click "Set".
Check "Import certificate from file" and click "OK" and browse to the location where you unzipped the files earlier.
Next to the Filename, click the dropdown and select "Personal Information Exchange (*.pfx) and select the voice.company.cloud.pfx file and click "Open"
Enter the password of *********
Click "OK" in the Security Settings and then Save. This will restart all the IP Office services.
After waiting a couple of minutes browse to
and ensure that your browser shows the green padlock.
For Windows I have never had to do it but my docs say it is done as follows
Adding the SSL Certificate to the Windows Server - Following Oak Remote Installation
Open the IIS Manager from the Server Manager.
Select the local server in the configuration tree and then double click on the Server Certificates Icon
In the Actions menu on the right hand side, select Import
Browse for the *.voice.company.cloud PFX certificate used for the IP Office and enter the password. Select Web Hosting from the dropdown menu. Click OK
In the configuration tree, expand the Sites and click on OCP. In the Actions menu on the right hand side select Bindings
Click Add and enter HTTPS in the Type dropdown, leave the port to 443 for now, type clientname.voice.company.cloud in the Host Name field, select the imported SSL certificate in the dowpdown field. and click OK.
Remove the existing HTTP binding and then edit the newly created HTTPS binding to port 8050. Click Close
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