Go to Manage ANI -> ANI Map
Here Customer can add own number for ANI (Automatic Number Identification) . ANI (Automatic Number Identification) is a service that provides the receiver of a telephone call with the number of the calling phone. The method of providing this information is determined by the service provider
On click "Add" button following screen will appear. Enter your Caller Id and click "Save" button.
Now Caller ID add on customer account.