This European Telecommunication Standard (ETS) addresses the network management messages and procedures across the A-bis interface, which is defined as Qx in GSM.
Amendment 1 - Equipment Engineering - Environmental Conditions and Environmental Tests for Telecommunications Equipment; Part 1-3: Classification of Environmental Conditions Stationary Use at Weatherprotected Locations
Universal Personal Telecommunication (UPT) - Access Devices Dual Tone Multi Frequency (DTMF) Sender for Acoustical Coupling to the Microphone of a Handset Telephone
