BS ISO/IEC BRITISH STANDARD 15049:1997 Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Advice of charge supplementary services ICS 33.040.40; 35.110 BSi NOCOPYINGWITH BS ISO/IEC 15049:1997 National foreword This British Standard reproduces verbatim ISO/IEC 15049:1997 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee IST/6, Data communications, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references The British Standards which implement international or European publications referred to in this document, may be found in the BSI Standards Catalogue under the section entitled "International Standards Correspondence Index", or by using the “"Find" facility of the BSI Standards Electronic Catalogue A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and i, the ISO/IEC title page, pages i to vi, pages 1 to 63 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated.This willbeindicated inthe amendmenttableon the inside front cover. Amendments issued since publication This British Standard, having been prepared under the Amd. No. Date Comments direction of the DISC Board, was published under the authority of the Standards Board and comes into effect on 15 December 1997 BSI 04-2000 ISBN 0 580 28857 9 BS ISO/IEC 15049:1997 Contents Page National foreword Inside front cover Foreword vii Text of IS0/IEC 15049 1 @BSI04-2000 1