ETR 261-6 : 20001

Foreword
Introduction
1 Scope
2 References
3 Definitions, symbols and abbreviations
4 Survey of current supplementary service implementations
  4.1 Fixed network results
5 Survey of users in centrex and PBX environments
  5.1 Introduction
  5.2 The questionnaire
  5.3 Subjects
  5.4 Results
  5.5 Comparing usage between the two groups
  5.6 Discussion and conclusions
Annex A: Public-network-based supplementary services
         questionnaires
      A.1 Introductory letter
      A.2 The fixed network questionnaire
      A.3 The mobile network questionnaire
Annex B: Centrex and PBX supplementary services questionnaire
Annex C: Supplementary service tables by network type
      C.1 PSTNs
      C.2 ISDN fixed networks
      C.3 Analogue mobile networks - NMT, TACS, ETACS
      C.4 Digital mobile networks - GSM
History

States the results of the research work conducted to develop a European Telecommunication Standard (ETS) defining a harmonized minimum man-machine interface (MMI) for the access and control of public network based telecommunications services, and in particular supplementary services.