This read-write object indicates whether to accept, transfer, and deliver the Called Party Subaddress Information Element from the calling party to the called party. This is the reverse-direction subaddress delivery, carrying the caller's intended sub-destination behind a single shared ATM address through to the actual endpoint, so disabling it means calls relying on subaddressing to reach a specific sub-endpoint would land at the wrong default endpoint instead. A called ATM device hosting multiple logical destinations behind one address, distinguished only by subaddress, would misroute every call to its default destination if this were disabled.