The Transfer Override Caller ID setting allows you to override a call’s active Caller ID when transferring a call. You can find this setting under the outbound Dialer Settings section in the campaign’s General page, as well as under the inbound Queue Settings section in the queue’s General page.
The Transfer Override Caller ID setting allows you to replace the existing Caller ID with a custom Caller ID only if an agent transfers a lead or customer from the current campaign or queue to a different one, or to any (PSTN) phone number (this number can be internal or external, and the transfer can be performed manually or via disposition).