CARRIER SERVICES
                          BILLING MANUAL
                                Author         Charles Walker
                                Division       BTUK Carrier Services Finance
                                Address        pp 8.1
                                               Tenter House
                                               45 Moorfields
                                               LONDON
                                               EC2Y 9TH
                                Tel            (0171) 250 8226
                                Fax            (0171) 628 6478
                                e-mail         charles.walker@bt.com
                  ISSUE : 4.00
    BTUK
    Carrier Services Finance
    CS BILLING MANUAL                                     SECTION  Billing Manual
         CARRIER SERVICES 
           BILLING MANUAL  
                         ©  British Telecommunications Plc. 1996
    Issue 4.0                       Page i                  Issue Date: 07/08/22
     BTUK
     Carrier Services Finance
     CS BILLING MANUAL                                                                                   SECTION  Billing Manual
              VERSION            VERSION        DATE                          REASON FOR CHANGE
              HISTORY
                                   DRAFT        various    Draft documentation sent out to the industry for comments / 
                                  (numerous)               amendments prior to finalising the actual CS Billing Manual.
     Distribution of Finalised Billing Manual Documentation.
              VERSION            VERSION        DATE                            REASON FOR CHANGE
              HISTORY
                                     1.00                  Finalised version agreed by the industry - First issue.
                                     2.00      29.10.96    Manual brought up to QMS standards.
                                                           TIBS section included.
                                     3.0        6.05.99    Manual updated with BT Billing capability and sections renumbered.
     Issue 4.0                                                 Page ii                                       Issue Date: 07/08/22
       BTUK
       Carrier Services Finance
       CS BILLING MANUAL
                                                                                                                    SECTION : Billing Manual
                                                         CONTENTS                                                                      Page
       COVER                                                                                                                             (i)
       REASON FOR CHANGE                                                                                                                 (ii)
       CONTENTS                                                                                                                         (iii)
       I: Introduction                                                                                                                     1
       II: Billing Information                                                                                                             8
       01: In Span Interconnection (ISI), Third Party ISI & Interconnect Extension Circuits                                              22
       02: Operator - Operator Service                                                                                                   25
       101: BT Telephony Calls to the BT System                                                                                          26
       102: BT Transit Calls via the BT System                                                                                           27
       103: BT Operator Transit Calls via the BT System                                                                                  28
       104: BT International Outgoing Calls to Authorised Overseas Systems via the BT System                                             29
       105: BT International Incoming Calls from Authorised Overseas Systems via the Operator System handed over to the BT               30
       System
       110: BT Freefone™ 0800 Calls                                                                                                      31
       111: BT Lo Call™ 0345 Calls                                                                                                       32
       112: BT Premium Rate Service Calls                                                                                                33
       116: BT National Call™ 0990 Calls                                                                                                 34
       117: Phone Base™ Calls                                                                                                            35
       118: BT Timeline™ Service                                                                                                         36
       120: National Operator Assistance Service                                                                                         37
       121: Directory Enquiry Service                                                                                                    41
       122: International Operator Assistance Service                                                                                    43
       123: International Directory Enquiry Service                                                                                      45
       124: Emergency Service                                                                                                            47
       126: Radiotelephone Calls                                                                                                         48
       127: Non AVR Directory Enquiry Service                                                                                            49
       130: Customer Sited Interconnect                                                                                                  51
       140: Data Management Amendments                                                                                                   54
       141: Indirect Access Calls to the Operator System                                                                                 55
       150: Entries in BT’s Number Information System (NIS) and phone Books                                                              56
       151: Access to BT Directory Assistance System Database                                                                            58
       152: Supply of BT Phone Books                                                                                                     59
       153: Supply of BT Telephone Directories                                                                                           60
       154: Licence of use of BT’s NIS Database                                                                                          61
       301: Operator Telephony Calls to the Operator System                                                                              62
       302: Operator Transit Calls via the Operator System                                                                               63
       303: Operator BT to BT Transit Calls via the Operator System                                                                      64
       304: Operator International Outgoing Calls to Authorised Overseas Systems via the Operator System                                 65
       305: Operator International Incoming Calls from Authorised Overseas Systems via the BT System handed over to the                  66
       Operator System
       310: Operator Free Phone Calls (including Payphone Access)                                                                        67
       311: Operator Free Phone 0800 Calls (including Payphone Access)                                                                   68
       312: Operator Local Call Fee Access                                                                                               69
       313: Operator Premium Rate Service Calls                                                                                          70
       314: Operator Personal Numbering Service Calls                                                                                    71
       315: Operator National Calls                                                                                                      72
       700: Transfer Charge calls                                                                                                        73
       750: Services for which BT Cannot Bill                                                                                            75
       Customer Service Profile – Blank                                                                                                  76
       Issue 4.0                                      Page 1 of 84                          Issue Date:07/08/22