Normalized called-party numbers: E.164 format with the +prefix is used for external destination.
Therefore, called-number normalization is the result of globalization. Internal directory numbers are used for internal destinations. Normalization is achieved by stripping or translating the called numbers to internally used directory numbers.

This is a prerequisite for using the Device Connector tool, which allows you to onboard and register several devices simultaneously to the Webex Control Hub1. The Device Connector tool creates a workspace, an activation code, and activates all of your devices in one go1. This way you don't need to be physically present in the same room to activate the devices.
The other options are not required before onboarding devices by using the Control Hub:
Configuring the Control Hub organization ID on the devices is not necessary, as the Device Connector tool will send the device information to your Webex organization and generate activation codes for them1.
Acquiring a license for each device is not necessary, as you can assign licenses to users and devices after they are registered to the Webex Control Hub2.
Allowing HTTP traffic from each device to Control Hub is not necessary, as HTTPS connectivity is required for the Device Connector tool to communicate with the devices1.