have a look at the AT commands manual Chapter 12 (Audio Commands), there are various parametres to be configured, I have the latest version (2.0 - 24/02/2021) of the manual which is very extensive
12 Audio Commands ............................................................................................................................ 227
12.1. AT+CLVL Loudspeaker Volume Level Selection ................................................................ 227
12.2. AT+CMUT Mute Control ...................................................................................................... 228
12.3. AT+QAUDLOOP Enable/Disable Audio Loop Test ............................................................. 229
12.4. AT+VTS DTMF and Tone Generation ................................................................................. 229
12.5. AT+VTD Set Tone Duration................................................................................................. 231
12.6. AT+QAUDMOD Set Audio Mode ........................................................................................ 232
12.7. AT+QDAI Digital Audio Interface Configuration .................................................................. 233
12.8. AT+QEEC Set Echo Cancellation Parameters ................................................................... 235
12.9. AT+QSIDET Set the Side Tone Gain in Current Mode ....................................................... 236
12.10. AT+QMIC Set Uplink Gains of Microphone ........................................................................ 237
12.11. AT+QRXGAIN Set Downlink Gains of RX .......................................................................... 237
12.12. AT+QIIC Read and Write Codec via IIC ............................................................................. 239
12.13. AT+QTONEDET Enable/Disable DTMF Detection ........................................................... 240
12.14. AT+QLDTMF Play Local DTMF .......................................................................................... 241
12.15. AT+QWDTMF Play or Send DTMF Files to Far End .......................................................... 242
12.16. AT+QLTONE Play a Local Customized Tone ..................................................................... 243
12.17. AT+QAUDRD Record Media File ........................................................................................ 245
12.18. AT+QPSND Play WAV File ................................................................................................. 247
12.19. AT+QTTS Play Text ............................................................................................................ 248
12.20. AT+QTTSETUP Set TTS .................................................................................................... 250
12.21. AT+QWTTS Play Text or Send Text To Far End ................................................................. 251
12.22. AT+QAUDCFG Query and Configure Audio Tuning Process ............................................. 253
12.22.1. AT+QAUDCFG="alc5616/dlgain"
Set the Downlink Gain Level for Codec
ALC5616…… .............................................................................................................................. 253
12.22.2. AT+QAUDCFG="alc5616/ulgain" Set the Uplink Gain Level for Codec ALC5616 ... 254
12.22.3. AT+QAUDCFG="tonevolume" Set the Tone Volume ................................................ 255
12.22.4. AT+QAUDCFG="alc5616/pwrctr" Enable/Disable the Power Reset ........................ 256
12.22.5. AT+QAUDCFG="nau8814/dlgain" Set the Downlink Gain Level for Codec NAU8814…................................................................................................................................ 257
12.22.6. AT+QAUDCFG="nau8814/aoutput" Set the Analog Output for Codec NAU8814 ... 258
12.22.7. AT+QAUDCFG="encgain" Set Uplink ENC Gains ................................................... 259
12.22.8. AT+QAUDCFG="voltedtmfcfg" Set Duration and Volume of VoLTE DTMF Tone .... 260
12.22.9. AT+QAUDCFG="decgain" Set Downlink DEC Gains ............................................... 261
12.22.10. AT+QAUDCFG="fns" Enable/Disable Noise Suppression ................................ 262
12.22.11. AT+QAUDCFG="nau8810/config" Set Register Value of Codec NAU8810 ............. 263
12.23. AT+QAUDPLAY Play Media File ........................................................................................ 264
12.24. AT+QAUDPLAYGAIN Set Audio Playing Gain ................................................................... 265
12.25. AT+QAUDRDGAIN Set Audio Recording Gain .................................................................. 266
12.26. AT+QACDBLOAD Write ACDB File .................................................................................... 267
12 Audio Commands ............................................................................................................................ 227
12.1. AT+CLVL Loudspeaker Volume Level Selection ................................................................ 227
12.2. AT+CMUT Mute Control ...................................................................................................... 228
12.3. AT+QAUDLOOP Enable/Disable Audio Loop Test ............................................................. 229
12.4. AT+VTS DTMF and Tone Generation ................................................................................. 229
12.5. AT+VTD Set Tone Duration................................................................................................. 231
12.6. AT+QAUDMOD Set Audio Mode ........................................................................................ 232
12.7. AT+QDAI Digital Audio Interface Configuration .................................................................. 233
12.8. AT+QEEC Set Echo Cancellation Parameters ................................................................... 235
12.9. AT+QSIDET Set the Side Tone Gain in Current Mode ....................................................... 236
12.10. AT+QMIC Set Uplink Gains of Microphone ........................................................................ 237
12.11. AT+QRXGAIN Set Downlink Gains of RX .......................................................................... 237
12.12. AT+QIIC Read and Write Codec via IIC ............................................................................. 239
12.13. AT+QTONEDET Enable/Disable DTMF Detection ........................................................... 240
12.14. AT+QLDTMF Play Local DTMF .......................................................................................... 241
12.15. AT+QWDTMF Play or Send DTMF Files to Far End .......................................................... 242
12.16. AT+QLTONE Play a Local Customized Tone ..................................................................... 243
12.17. AT+QAUDRD Record Media File ........................................................................................ 245
12.18. AT+QPSND Play WAV File ................................................................................................. 247
12.19. AT+QTTS Play Text ............................................................................................................ 248
12.20. AT+QTTSETUP Set TTS .................................................................................................... 250
12.21. AT+QWTTS Play Text or Send Text To Far End ................................................................. 251
12.22. AT+QAUDCFG Query and Configure Audio Tuning Process ............................................. 253
12.22.1. AT+QAUDCFG="alc5616/dlgain"
Set the Downlink Gain Level for Codec
ALC5616…… .............................................................................................................................. 253
12.22.2. AT+QAUDCFG="alc5616/ulgain" Set the Uplink Gain Level for Codec ALC5616 ... 254
12.22.3. AT+QAUDCFG="tonevolume" Set the Tone Volume ................................................ 255
12.22.4. AT+QAUDCFG="alc5616/pwrctr" Enable/Disable the Power Reset ........................ 256
12.22.5. AT+QAUDCFG="nau8814/dlgain" Set the Downlink Gain Level for Codec NAU8814…................................................................................................................................ 257
12.22.6. AT+QAUDCFG="nau8814/aoutput" Set the Analog Output for Codec NAU8814 ... 258
12.22.7. AT+QAUDCFG="encgain" Set Uplink ENC Gains ................................................... 259
12.22.8. AT+QAUDCFG="voltedtmfcfg" Set Duration and Volume of VoLTE DTMF Tone .... 260
12.22.9. AT+QAUDCFG="decgain" Set Downlink DEC Gains ............................................... 261
12.22.10. AT+QAUDCFG="fns" Enable/Disable Noise Suppression ................................ 262
12.22.11. AT+QAUDCFG="nau8810/config" Set Register Value of Codec NAU8810 ............. 263
12.23. AT+QAUDPLAY Play Media File ........................................................................................ 264
12.24. AT+QAUDPLAYGAIN Set Audio Playing Gain ................................................................... 265
12.25. AT+QAUDRDGAIN Set Audio Recording Gain .................................................................. 266
12.26. AT+QACDBLOAD Write ACDB File .................................................................................... 267
