Dear LaForge, the MS RF Power Capability Indication ABIS message has the aim to transfer (from BSC to BTS) information about the power capability and the codec capability of the MS. This is necessary in Siemens Networks because the Handover and Power Control algorithms are handled in BTS. Instead the MS capability are transferred in transparent way from MS directly to BSC. BTS is aware of the MS capability up to the receiption of this message from BSC.