I have a few kirk 6020 and 5020 in my company. Environment is pretty noisy and the phone don't handle it very well. I made a few test with my HTC mobile phone and it can reduce the noise very well. Why my kirk phone can't do the same and is there any way to increase noise reduction ?
Can you tell me the firmware version of your KIRK 6020 handset?
In earlier versions of the firmware we have had a non obtimal AGC setting resulting in reduced performance in high noise environments.
If the fw does not resolve this you might also look at reducing the sensitivity of the mic or use noise canceling headsets.
For the mic gain settings work with your reseller who can help with this.