scope:

This ETS specifies the electro-acoustic performance characteristics of telephony terminals which are intended for direct application to the ear (e.g. traditional handsets, operators' headsets) and which provide, at the earphone, additional amplification in the receiving direction compared with the Receiving Loudness Rating (RLR) specified in the relevant terminal standard.

This ETS applies to telephony terminals that can be connected to the Public Switched Telephone Network (PSTN) or the coincident S and T reference point of the basic access of the Integrated Services Digital Network (ISDN).

Hands free or loudspeaking devices and extra amplification in sending for the benefit of people having speech impairments are outside the scope of this ETS.