ISO/IEC-13872 Complete Document History
Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network Specification, functional model and information flows Call Diversion supplementary services

Complete Current Edition:
   2ND EDITION - INFORMATION TECHNOLOGY - TELEC - April 1, 2003

Obsolete Revision Information:
   1ST EDITION - INFORMATION TECHNOLOGY - TELEC - Dec. 15, 1995