EN 300 188-1 : 1.2.4

Intellectual Property Rights
Foreword
1 Scope
2 Normative references
3 Definitions
4 Abbreviations
5 Description
6 Operational requirements
   6.1 Provision and withdrawal
   6.2 Requirements on the originating network side
   6.3 Requirements on the destination network side
7 Coding requirements
   7.1 Coding of the Facility information element
       components
   7.2 Coding of the Notification indicator information
       element
8 State definitions
9 Signalling procedures at the coincident S and T
   reference point
   9.1 Activation, deactivation and registration
   9.2 Invocation and operation
10 Procedures for interworking with private ISDNs
11 Interactions with other networks
12 Interactions with other supplementary services
13 Parameter values (timers)
14 Dynamic description (SDL diagrams)
Annex A (informative): Signalling flows
   A.1 Request for a three-way conversation
   A.2 Disconnection of one remote user, and retention
       of the other
   A.3 Disconnection of both remote users and terminating
       the call
   A.4 Creation of a private communication with a remote
       user
   A.5 Remote user terminates the call
Annex B (informative): Changes with respect to the previous
        ETS 300 188-1
History

Defines the stage three of the Three Party (3PTY) supplementary service for the pan-European Integrated Services Digital Network (ISDN) as provided by European public telecommunications operators at the T reference point or coincident S and T reference point by means of the Digital Subscriber Signalling System No. one (DSS1) protocol. Specifies the protocol procedures and switching functions needed to support a telecommunications service. Identifies the protocol requirements at the T reference point where the service is provided to the user via a private ISDN.