scope:

This first part of ETS 300 754 specifies the stage three of the Message Waiting Indication (MWI) supplementary service for the pan-European Integrated Services Digital Network (ISDN) as provided by the European public telecommunications operators by means of the Signalling System No.7 Transaction Capabilities (TC) application protocol. The stage three identifies the protocol procedures and switching functions needed to support a telecommunication service (see CCITT Recommendation I.130 [7]).

This ETS specifies the additional requirements where the service is provided to the user via an intermediate ISDN.

This ETS does not specify the additional requirements where the service is provided to the user via a telecommunication network that is not an ISDN.

The MWI supplementary service is provided independently of a call and is therefore applicable to a number of telecommunication services.

Charging principles are outside the scope of this ETS.

Testing and maintenance requirements are outside the scope of this ETS.

The MWI supplementary service enables the network, upon the request of a controlling user to indicate to the receiving user that there is at least one message waiting.

NOTE: The MWI supplementary service is typically used between a mail box service provider (controlling user) and a user (receiving user) of the mail box service provided.