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However, this\u000aparadigm is contrary to classic GSM BSS architecture in which BFI\u000ais an out-of-band metadata flag that travels alongside with frame\u000apayload bits, whether the latter are valid or invalid.\u000a\u000aSince 2024 OsmoBTS supports the option of TW-TS-001 output for\u000aFR and EFR codecs, which allows the possibility of BFI-with-data\u000ain RTP. OsmoBTS can already emit such BFI-with-data packets when\u000athe BTS model delivered a deemed-good traffic frame, but that frame\u000awas subsequently deemed bad by the link quality check in l1sap -\u000abut there is still no explicit out-of-band BFI flag inside OsmoBTS\u000aTCH UL path.\u000a\u000aBy introducing an out-of-band BFI flag, we make it possible for BTS\u000amodel PHYs to deliver marked-bad traffic frames: when CRC fails\u000ain GSM 05.03 channel decoding step, a PHY that permits modification\u000a(libosmocoding or future FOSS DSP PHY) can be enhanced to preserve\u000achannel-decoded bits while conveying BFI.\u000a\u000aThe link quality check in l1sap is reworked to use the new OOB BFI\u000aflag. 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