ETSI TS 103 334 provides speech transmission performance requirements for wireless terminals; it is limited to wearable terminals, including devices worn on the user's wrist. Headsets are out of scope.

In contrast to other standards which define minimum performance requirements it is the intention of the present document to specify terminal equipment requirements which enable manufacturers and service providers to enable good quality end-to-end speech performance as perceived by the user, whatever be the radio link (terminals may implement different radio links with the access network).

When an additional radio link between the terminal and external electroacoustical devices is used (e.g. Bluetooth® link), the standard will address the overall quality.

In the present document objective measurement methodologies and requirements for wireless wearable speech terminals are given.