Huawei MU509 Series Design Manual page 18

HUAWEI LGA Module PCM Audio Design Guide Reference Design
AT^CPCM is the AT command for the configuration of PCM. For the details, please
refer to the module's AT command interface specification.
If using the codec configuration above, you need to keep parameter values of
AT^CPCM as default values.
If you want to use the module's I2C to control NAU8814, please run
AT^CODECPOW=1 firstly and then dial others.
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