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514 TRANSACTION CAPABILITIES APPLICATION PARTNational TCAP refers to TCAP applications in ‘fixed” telecommunication networks,which are specified by ANSI and Telcordia.Private TCAP applications are defined by the Electronic Industries Alliance(EIA) and the Telecommunications Industry Association (TIA) for use in mobilenetworks.For identifiers (Tags) with H,G ¼ 1,1 in octet 1 (see Fig. 16.2-3), the values in theidentifier code field are divided into separate ranges, for national and private use. Allvalues in one-octet identifier fields are assigned to national TCAP. In multiple-octetfields, the value of bit G in octet 2 indicates whether the code is assigned to nationalTCAP (G ¼ 0) or private TCAP (G ¼ 1).In general, if an ITU-T information element is coded as “application-wide,” thecorresponding ANSI data element is coded as “national TCAP.”Further details on Identifier coding of national TCAP DEs can be found in [9].16.4.4 Value Coding of Data ElementsNational TCAP Error-Code DE. ANSI has specified a one-octet value field forthe Error-Code DE in Return-Error packages. The value indicates the reason forsending the Return-Error:Unexpected component sequence 0000 0001Unexpected data value 0000 0010Unavailable network resource 0000 0011Reply overdue 0000 0101Data not available 0000 0110National TCAP Problem DE. The Problem-Code DE has a two-octet value field.The first octet (known as problem code) indicates the nature of the problem (generalproblem, invoke problem, etc.) The second octet (problem specifier) indicates aspecific problem (unrecognized component duplicate Invoke ID, incorrect parameter,etc.).Further details on the coding of value fields for national TCAP data elements canbe found in [9].National TCAP Constructor and Primitive DEs. Table 16.4-1 shows that ifan IE is a constructor (C), the corresponding DE is also a constructor, and thesame holds for primitive (P) IEs and DEs. Some minor exceptions (not shown inthe table) exist and further details can be found in [9].16.5 ETSI TCAPThe European Telecommunications Standard Institute (ETSI) has adopted the ITU-Trecommendations virtually unchanged. Minor differences are spelled out in [10].