Reaffirmed 2023

NATIONAL FOREWORD

This Indian Standard which is identical with ISO/IEC 13863 : 1998 ‘Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Path replacement additional network feature’ issued by the International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC) jointly and was adopted by the Bureau of Indian Standards on the recommendations of the Information and Communication Technology Sectional Committee and approval of the Electronics and Information Technology Division Council.

The text of the ISO/IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are however not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.