Alternative to Changing an Executive's outgoing CID

Rather than changing our Executive Director's caller ID on outgoing calls or setting this user's personal operator an alternate approach I went with here is to use an inbound translation rule on the dial plan applied to the SIP trunk. If someone internal tries to call our Executive Director's DID they reach her as normal, but if she is dialed by someone external to our organisation the caller is connected to a response group containing the person or persons who you would normally set as the executive's personal operator.