Cortelco phones working with Audiocodes MP1288
Hello, We recently installed multiple MP1288s in our environment. We have a large number of Cortelco 255400VBA-20M phones spread throughout our campus. Currently we are experiencing an issue where the phones do not ring loud enough to be heard. The sound is a muffled clicking. I have found that when you slide the volume adjuster to the halfway point on the phones, they can be heard but not loud enough for most areas. I am currently troubleshooting this issue with an Audiocodes tech, but still have not figured out a way to get the volume of the bell loud enough. Has anyone ever come across this problem? I have checked the firmware. We have attempted to change the Trapezoid Ring Parameter, to no avail. Any help would be appreciated.
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