Table of Contents

Foreword
1 Scope
2 Normative references
3 Definitions
4 Symbols and abbreviations
5 Description
6 Derivation of the functional model
  6.1 Functional model description
  6.2 Description of the functional entities
  6.3 Relationship with a basic service
7 Information flows
  7.1 Information flow diagrams
  7.2 Definition of individual information flows
8 SDL diagrams for functional entities
  8.1 DDI functions in FE1 - reception of DDI digits
  8.2 DDI functions in FE2 - transmission of DDI
      Digits
9 Functional entity actions (FEAs)
  9.1 FEAs of FE1
  9.2 FEAs of FE2
10 Allocation of functional entities to physical
   locations

Abstract

Defines the stage two of the Direct Dialling In (DDI) supplementary service for the pan-European Integrated Services Digital Network ((ISDN) as given by European public telecommunications operators. Does not specify the requirements where the service is given to the user via a private ISDN. Defines which functional entities may be allocated to a private ISDN; does not specify the requirements for the allocation of defined functional entities. Does not formally describe the relationship between the basic call and this supplementary service. Does not specify the additional requirements where the service is given to the user via a telecommunications network that is not an ISDN.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	European Telecommunications Standards Institute
Pages
ISBN
Committee	SPS 1