I tell our customers to NEVER go above 3 or 4. It's a 20 point scale---normal is "0"--"9" & "10" are at the extreme. At about 6 or 7--you start to have over-modulation problems.

A loud ambient noise area is not a good environment for these types of phones (either the 9100 or 9200 series). They are designed to be office phones. Cranking the volume up to maximum level does nothing but create problems. If your customers have to do that in order to hear---then something is wrong with the phone, the environment or the user. In some areas, speaker phones just can't be used efficiently.

Also, I have seen some computers & speakers create some difficulties with the Allworx phones. Some sort of RF interference possibly. I have had it happen in our office, but when I move things around, it stops. The same thing happens with my cell phone and my computer speakers. Electronics are wonderful devices, but sometimes they seem to have a mind of their own.

Rockford VoIP