Some users may want to have a phone number that will provide Direct Inward Dialing (DID). This allows external callers to call an extension directly from an external number. 

Configuration

In the admin portal,

1. Navigate to the Inventory tab
2. Click on the Phone Number you want to assign
3. In the pop-up window select User from the Treatment drop-down
4. Type the user's name or extension into the User field 
5. Click Save

To make this DID the user's outbound caller ID:

1. Navigate to Users
2. Search for and click on the user
3. Drop-down the Caller ID field to the assigned DID
4. Click Save