On the web app, click the Make a Call dialog.
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Figure 55: Make a Call Dialog

On mobile app, tap the Caller ID Picker. A pop-up screen will appear.

Figure 56: Caller ID Picker on the Mobile App

The phone numbers assigned to users depend on the tenant's settings. For example, a phone number can be specifically assigned to a user or allocated to an Auto-Receptionist (AR) or Call Queue (CQ) with the user listed as an operator.