"Proponents of this service want the right to restrict identification disclosure. In an attempt to protect their privacy customers can request a blocking service. This will restrict the receiver of the call to identify the incoming caller. In retaliation, Bell Atlantic which is a "Philadelphia-based regional phone company, is now offering an anti-anti-Caller ID service Called (Anonymous Call Rejection) ACR."(с)

)) интересно а есть anti-anti-anti-Caller ID?