Table of Contents

Foreword
1 Scope
2 Normative references
3 Definitions
4 Symbols and abbreviations
5 Description
6 Operational requirements
   6.1 Provision and withdrawal
   6.2 Requirements on the network A side
   6.3 Requirements on the network B side
7 Coding requirements
8 State definitions
   8.1 User A states
   8.2 User B states
   8.3 Network A states
   8.4 Network B states
9 Signalling procedures at the coincident S and T
   reference point
   9.1 Activation
   9.2 User initiated deactivation procedure
   9.3 Interrogation
   9.4 Invocation and operation
   9.5 Procedures at network B
   9.6 Call information retention
   9.7 Basic call information and compatibility
       checking at user A
10 Procedures for interworking with private ISDNs
   10.1 Procedures for the originating T reference point
   10.2 Procedures for the destination T reference point
11 Interactions with other networks
12 Interactions with other supplementary services
13 Parameter values (timers)
14 Dynamic description (SDL diagrams)
Annex A (informative): CCBS signalling flows
Annex B (normative): Provision of status request
        procedures
Annex C (informative): Assignment of object identifier
        values
History

Abstract

Specifies the stage three of the Completion of Calls to Busy Subscriber (CCBS) supplementary service for the pan-European Integrated Services Digital Network (ISDN).

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	European Telecommunications Standards Institute
Pages
ISBN
Committee	SPS 5
Supersedes	PRETS 300 359-1 : AUG 93