I have just installed a 7406E to replace a 7406, 3 handsets. These units are used at a reservation counter with crowd of people standing around. The customer is complaining of the mic is so sensitive (over the older 7604) that they can't hear the calling party. I found that to be true. I found in the Function Menu a setting for Noisy Location with no description. The sets are set to Level 1. I changed it to Level 4. I could actually hear keystrokes on a keyboard from across the room. I read a previous thread for the same problem. Is there a solutions or ideas out there. Sounds like most people are very satisfied with them.