FAQ/Why is the outgoing audio noisy and low when using the snom headset on the snom300
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The headset was originally designed for snom 320/360 but due to design changes on the snom 300 there is a difference in the microphone pin-out which produces the mentioned noise. snom will provide a new headset as soon as possible (aprox. 08/2006). A workaround is to increase the microphone volume via the Web Interface to 7-8.
In any case follow the guidelines mentioned here.