Howto:Adjusting volume parameters on IP111 and IP112

Applies To

• IP111 with V11r1 and above

Problem

• Customers might need control over the microphone sensitivity to lower background noise pickup
• Customers might need higher speaker volume of handset or loudspeaker than configurable on the phone

Summary

The microphone sensitivity of the handset can be controlled with a sequence of commands along the lines

  http://ip-adress-of-the-phone/!config add AC-DSP0 HANDSET /ADC_Gain 21
  http://ip-adress-of-the-phone/!config activate

Presently 21 is the default. Decreasing the value by 4 decreases the sensitivity by 6 dB. The allowed range of the ADC_Gain parameter is 0..31. The same command can be applied for speakerphone mode with name SPEAKER instead of HANDSET.

Higher speaker volume can be achieved by a command

  http://ip-adress-of-the-phone/!config add AC-DSP0 HANDSET /Coder_Output_Gain 34,32,30,28,26,24,22,20,18,16
  http://ip-adress-of-the-phone/!config activate

where each value of the comma separated list (default shown) corresponds to one of the volume steps. Decreasing each by 4 increases the volume by 6 dB. The permitted range of the values is 0..63. The same command can be applied for speakerphone mode with name SPEAKER instead of HANDSET.

To avoid hearing damage, please be careful with the values! Increase the values step by step. You hear the difference after the !config activate

Clipping may occur for high audio levels from the peer if the speaker volume has been increased.

If you are satisfied with the settings, type:

  http://ip-adress-of-the-phone/!config write

Now, the values are stored in the config.

Please note, that the default values might change without notice in future DSP code updates and also the actual sound pressure corresponsing to these values might change. Please re-evaluate tweaks after firmware update and assert the commands above again.

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