IPOthermia

Check the 46xxsettings.txt file on your TFTP or HTTP server that is providing files for your phones. I am not sure if the older settings files have this, but the one I just implemented has AGC related settings for Automatic Gain Control.

## Automatic Gain Control (AGC).
## These settings enable or disable AGC.
##
## A value of 1 enables AGC. A value of 0 disables AGC.
## AGCHAND controls handset AGC
## AGCHEAD controls headset AGC
## AGCSPKR controls speaker AGC
##
SET AGCHAND 1
SET AGCHEAD 1
SET AGCSPKR 1

Take out the '## ' at the front of the lines for AGC. Change settings from 0 to 1.
Restart a phone or two. Restarting the phone will cause it to load the updated settings file.
TEST and see if this helps. If yes restart more phones, if not put the file back the way it was forget this was ever posted.