Intermittent buzzing can be caused by electrical equipment located in the immediate area of the telephone and headset system, such as fluorescent lighting, computers, fax machines, typewriters, and power strips (surge protectors).
Frequently, power cords and cables that are bundled together will cause buzzing.
The best solution is to keep this type of equipment separated from the headset, amplifier and telephone.
There are several factors that could be causing a buzz or humm on a headset. A lot depends on what model you are using.
Wireless Models such as Supra Plus Wireless, CS50, CS55, CS70, CS60, CS351, CS351N, 510S
M10/M12 & M22:
Go to the slide switch settings on the left hand side of the Vista M10/M12. In some cases it should be set at 6 rather than 5. If that does not help the situation, the problem could be environmental, from electrical devices in your area. It could also be a compatibility issue with your telephone.
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