Returns the customer's verified Caller IDs (CLIs) that may be used for outbound calls. When locked is true, the customer may only call using the listed Caller IDs; when false, any Caller ID is allowed. limitations.capacity maps a Caller ID to its maximum concurrent call capacity and contains only numbers with a capacity limit. caller_ids lists every Caller ID of the account, including those still waiting for verification, with the id used to verify or delete it.