Access the SPA-941 web-based setup page.
Click Admin Login, then advanced.
Scroll down and look for Audio Input Gain (dB). Set the Handset Input Gain to -6 or 6.
Note: Check if sound quality on the phone has improved. If not, proceed to Step 6.
Click EXT 1.
Look for Silence Supp Enable, and set it to yes.
Note: If you are still encountering the same problem after these changes, reset the device to the factory default, and reconfigure it. For instructions on how to reset the SPA-941, click here.