Digital Cellular Telecommunications System; Full Rate Speech; Substitution and Muting of Lost Frames for Full Rate Speech Channels (GSM 06.11 Version 5.0.1)
This European Telecommunication Standard (ETS) defines a frame substitution and muting procedure which shall be used by the RX DTX handler when one or more lost speech or SID frames are received from the radio subsystem. The requirements of this ETS are mandatory for implementation in all GSM Base Station Systems (BSS) and Mobile Stations (MS).