Increase Microphone volume on Cisco 7960?

[BensTechTips]

Hi all,

I have 6 x IP Phones 7960G's connected to my server. I am running the phones using SIP on a Kerio Operator server (3rd party appliance).

I am having trouble because the person on the other end of the phone sometimes has trouble hearing because the sound is too low from the person on the 7960.

Is there anyway of increasing the microphone volume on the 7960G phone?

Thanks in advance!

-Ben

[paolo bevilacqua]

I have deleted my answer here (that was 100% correct and made with the will to help), due to the low rating unfairly given.