When the calling user wishes to notify the called user of its information transfer attributes (type II information -octets 3 and 4) or any low layer protocol (type I information - octets 5 to 7) to be used during the call and not already identified in the Bearer capability information element, then the calling user shall include a Low layer compatibility information element in the SETUP message; this element is conveyed by the network and delivered to the called user. However, if the network is unable to convey this information element, it shall act as described in 5.8.7.1 (unrecognized information element).