F225 is for incoming translations only. f31 is the only field you have that will change the carriers default CID. Once the CID field is populated for that ext. in f31 the entered digits will appear with the name as "unavailable" as the CID for outgoing calls on that ext. This is per ext. If the CID field in F31 is blank the carrier will send the CID listed for the PRI. It may appear that the digits entered in f225 are what is being sent but only because that is same number as the main BTN listed with the carrier to send as the CID.