Here's a KB article on how to customize RingOut numbers.
Not sure what you want to achieve exactly but one suggestion is:
Admin Portal > Users > click on a user > Outbound calls/faxes > caller ID
Here you can edit the default number used for RingOut.
Additionally you could remove the permission of a user to change his caller ID, so that you guarantee that the user extension uses the default caller ID you set there.
Is this what you want to achieve or is it something else?
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