Rate Adaptation on the Base Station System - Mobile Service Switching Centre (BSS-MSC) Interface
The present document defines rate adaptation functions to be used in GSM PLMN Base Station Systems (BSS) transcoders and IWF for adapting radio interface data rates to the 64 kbit/s used at the A-interface in accordance with 3GPP TS 03.10.
The number of Base Station System - Mobile-services Switching Centre (BSS - MSC) traffic channels supporting data rate adaptation may be limited. In this case some channels may not support data rate adaptation. Those that do, shall conform to this specification.
NOTE:	This specification should be considered together with 3GPP TS 04.21 to give a complete description of PLMN rate adaptation.