Select the Call Center Configuration - 3CX Call Center - this will automatically add all required default values for 3CX.
If 3CX is used with MS Teams APP (instead of 3CX SoftPhone), then a separate call center must be created for the users with MS Teams and the cloud service URL must be changed.
Mirage Cloud Service URL: https://ie3.miragecloud.com/octi3cx10dll1803
The VoipTools server installation needs to be done by Mirage.
Check: Active
The API URL is the domain of your 3CX server + :8801/api
The 3cx extension number must be added in the user record to get a match between Salesforce user and 3CX extension. Add the number in the field extension.
See also
3CX Presence State
3CX - Call Controls