This read-write object indicates whether the Calling Party Number Information Element is transferred to the called party, enabled or disabled. It determines whether the called party's ATM device actually receives the caller's identifying address information at all, akin to caller ID, so disabling it would break any application on the far end that relies on knowing who is calling, even though the call itself would still connect normally. An application on the called side that authorizes calls based on the calling party's ATM address would silently see no caller information and might reject or mishandle every call if this were set to disabled.