Section: O.2 User-user protocol contents
Content: The user-user protocol contents is included in the user-user information element described in subclause 10.5.4.25. The user-user protocol contents is structured like the non-imperative part of a standard L3 message (see 3GPP TS 24.007[ Mobile radio interface signalling layer 3; General Aspects ]  [20], subclause 11.2) and is composed of a variable number of information elements of type 1, 2, 3 and 4. The different formats (TV, TLV) and the categories of information elements (type 1, 2, 3 and 4) are defined in 3GPP TS 24.007[ Mobile radio interface signalling layer 3; General Aspects ]  [20]. Within the user-user protocol contents the information elements may occur in an arbitrary order. All information elements shall be included only once. Figure O.1/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  User-user information when the user-user protocol indicator is set to "3GPP capability exchange protocol"