Q callbacks can only be provisioned with the CID of an existing queue. This does not use the Q's Manual Outbound or Transfer Override Caller ID settings. It appears its using a phone number assigned to a channel that routes the call to the Q.

Customer is requesting an option to include / enter an external number as the CID.

Currently, if another number is entered in the "Callback from Queue" field, it is disregarded and uses the default queue, which results in the channel's phone number assigned to the Q.

Customer supports multiple residential properties and all calls originally reaches these properties. If calls are not answered or REX CQs wait settings are reached, it forwards to RCX via CCRN. These CCRNs are not published and customer prefers these are not to be used as Callback CIDs and would like to use their main published number. This main published number is also an external number which has been approved as a Substitute CallerID and completed the process for the account.