CONTENTS

1 Scope 
 2 Normative references       
        2.1 ITU-T Recommendations  
        2.2 ISO/IEC Standards           
        2.3 Other references    
3 Definitions  
4 Abbreviations   
5 Conventions     
6 Basic concepts and models          
        6.1 Functional model   
        6.2 Service models      
7 Principles for the organization of an interconnected computerized international information service     
8 Service specification        
        8.1 Inquiry information 
        8.2 Reply information   
        8.3 Conversion
        8.4 Version 2 extensibility        
        8.5 Functionality          
9 Common protocol specification elements  
        9.1 Character subsets and encoding     
        9.2 Filter concept        
        9.3 Matching and matching rules          
        9.4 Paging    
        9.5 Hierarchical groups
        9.6 The keyword concept of version 1 
10 Version 1 of the Directory Assistance protocol specification        
       10.1 Overview 
       10.2 Inquiry format       
       10.3 Reply format         
11 Version 2 of the Directory Assistance protocol specification        
       11.1 Overview 
       11.2 Inquiry format       
       11.3 Reply format         
12     Fixed Header Protocol (FHP)     
       12.1 Introduction          
       12.2 Security context    
       12.3 Negotiation result  
       12.4 Data transfer phase           
       12.5 Exception conditions         
       12.6 Format of FHP protocol elements 
       12.7 Fields common for all message types         
       12.8 Specific fields       
       12.9 Use of the service provided by TCP          
13     Use of the service provided by the HTTP
       13.1     Introduction          
       13.2 Support levels       
       13.3 Requested service and protocol version selection   
       13.4 Exception conditions         
14 Operator's manual          
Annex A – Directory Assistance keywords of Directory Assistance protocol version 1     
        A.1 Functional keywords table 
        A.2 Descriptive keywords table           
Annex B – Directory Assistance protocol version 1 in ASN.1     
Annex C – Directory Assistance protocol version 2 in ASN.1     
Annex D – Directory assistance protocol version 2 in XSD     
Annex E – Message codes for Recommendation E.115     
Appendix I – NACE nomenclature     
        I.1 About NACE      
        I.2 NACE structure   
        I.3 NACE at work    
        I.4 Extract from NACE         
Appendix II – Examples of BER encodings     
       II.1 Introduction           
       II.2 Example of ASN.1 BER encoding of the DA protocol version 1     
Appendix III – ISO/IEC 10646, UTF8-encoding and relationship with ISO/IEC 8859-x     
      III.1 Introduction           
      III.2 UCS Transformation Format 8 (UTF-8)     
      III.3 BASIC LATIN and LATIN-1 SUPPLEMENT subsets     
      III.4 LATIN EXTENDED-A subset and relationship to ISO/IEC 8859-2/3/4    
      III.5 CYRILLIC subset and relationship to ISO/IEC 8859-5     
      III.6 BASIC GREEK subset and relationship to ISO/IEC 8859-7