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• File src/libmsc/codec_mapping.c:

  • Patch Set #1, Line 29: FIXME: I'm not sure about OFR, OHR -- O means octet-aligned??

    I don't know for sure what the 'O' means, but according to 3GPP TS 45.002, section 3.2.1, O-TCH/F and O-TCH/H are full/half rate channels employing 8-PSK modulation (on "normal" TCH channels it's GMSK). Perhaps 'O' means 'Octal'? An 8-PSK modulated burst carries three times more bits than a GMSK modulated burst, so you basically get three times higher bit rate. If I remember correctly, such channels are used for AMR-WB (wide band).

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