Find your original 3CX "Welcome Email" and click the provided link to log in.
If you are an IT manager rolling out 3CX to a fleet of MacBooks, consider using a Mobile Device Management (MDM) solution like Jamf to push the 3CX app and provisioning profile silently. 3cx Phone Download Mac
While any headset works, the 3CX Mac client works best with: Find your original 3CX "Welcome Email" and click