ETS 300 057 : 20001

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 flow
  7.1 Information flow diagrams
  7.2 Definition of individual information flows
8 SDL diagrams for functional entities
  8.1 CW supplementary service functions in FE1
  8.2 CW supplementary service functions in FE2
  8.3 CW supplementary service functions in FE3
9 Functional entity actions (FEAs)
  9.1 FEAs of FE1
  9.2 FEAs of FE2
  9.3 FEAs of FE3
10 Allocation of functional entities to physical
   locations
History

Defines the stage two of the Call Waiting (CW) supplementary service for the pan-European Integrated Services Digital Network (ISDN) as given by European public telecommunications operators. Does not formally describe relationship between the basic call and the supplementary service, but the information is included for guidance (where possible). Defines which functional entities may be allocated to a private ISDN, but it does not specify the requirements for the allocation of defined functional entities within a private ISDN. Does not specify the additional requirements where the user receives the service via a telecommunications network that is not an ISDN.