scope:

This ETS defines the minimum man machine interface for use to gain access to and control of supplementary services within public telecommunications networks. It describes the requirements to be met jointly by the service provider, the network operator and the terminal manufacturer necessary to ensure provision of the minimum manmachine interface.

This ETS applies to network based supplementary services provided within:

- the Public Switched Telephone Network (PSTN);

- the Integrated Services Digital Network (ISDN);

- the analogue Public Land Mobile Networks (PLMN), including: Total Access Communication Systems (TACS), Extended Total Access Communication Systems (ETACS) and Nordic Mobile Telephone System (NMT);

- the Global System for Mobile Communications Public Land Mobile Network (GSM - PLMN), including the Digital Cellular System (DCS) 1800;

- Satellite Personal Communications Network (S-PCN);

- Universal Mobile Telecommunications System (UMTS);

- Universal Personal Telecommunications (UPT).

This ETS does not apply to supplementary services provided within private telecommunications networks, but will apply to public network based services accessed from a private network.

This ETS does not apply to supplementary services that are provided by private networks (or servers) which are attached to the public network and can be accessed from it.

This ETS applies to all telecommunications terminals that are intended to access the supplementary services provided within the public networks.