There is a difference in the biasing circuit for the microphones in the headsets. Unfortunately there is no standard on the market. The snom phones 190/320/360 (let's say: type A) behave different than snom 300 (type B). So there is always the need to have different headsets or different cables (Quick Disconnect). Some headsets are just working with one type (those with extra amplifier) and other devices seem to work in both environments, but that's not really true. The headsets are always working much better with just one type. So if someone has a headset designed for type A, he'll have a bad quality while connecting it to type B phones although he is able to here something.
Don't forget to have a connection to an earth-signal (e. g. shielded Ethernet cable to PC/switch or earth-grounded power supply).
Hope this helps, CS
We are using the Snom 300 with Snom HS MM headsets,(yes the switch and cable are ground-signaled) all bought together. We are testing it for a call center (100 seats) deploy and as i said first we are very disappointed with the performace of them. Going to RMA them and get some Linksys 841.
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