Section: C.2.1 Definition of types of information
Content: There are three different types of information that the calling PLMN user may specify during call setup to identify low layer capabilities needed in the network and in the destination terminal: a) type I information is information about the calling terminal which is only used at the destination end to allow a decision regarding terminal compatibility. An example would be the user information layer 3 protocol. Type I information is encoded in octets 5 to 7 of the low layer compatibility information element; b) type II information is only used by the network (PLMN) to which the calling user is connected for selection of PLMN specific network resources, e.g. channel type or specific functionality within the interworking function (IWF, see 3GPP TS 23.093[ Technical realization of Completion of Calls to Busy Subscriber (CCBS); Stage 2 ]  [88a]). This type of information is always present. An example is the connection element. Type II information is coded in: i) octet 3 of the bearer capability information element when the information transfer capability required by the calling user is speech ; ii) octets 3, 4, 5, and optionally octet 7 of the bearer capability information element when the information transfer capability required by the calling user is not speech; c) type III information is required for selection of a basic service from the choice of basic services offered by the network and together with type II information for selection of an appropriate interworking function (IWF, see 3GPP TS 29.007[ General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN) ]  [38]), as well as for terminal compatibility checking at the destination terminal. An example is the information transfer capability. Type III information is always present and is encoded in: i) octet 3 of the bearer capability information element when the information transfer capability required by the calling user is speech ; ii) octets 3, 5, 6, 6a, 6b and 6c of the bearer capability information element when the information transfer capability required by the calling user is not speech;