Section: 4.7.1.2a.5 Optional establishment of integrity protection in the user plane
Content: If an MS supports integrity protection of user plane data, then the MS shall indicate in the MS network capability IE to the network that it supports integrity protection of user plane data when it sends an ATTACH REQUEST message or a ROUTING AREA UPDATE REQUEST message. If the network supports integrity protection of the user plane data, then the network shall indicate in the ATTACH ACCEPT message or the ROUTING AREA UPDATE ACCEPT message to the MS that integrity protection of user plane data shall be used.