Unwrapped, connected, made the first test call:
Crack in the line to understand dial tone barely. Turned a little on the connector and already you could tell: the scratch quite a bit. Then found a place where I apparently had contact (mind you: the C610 IP is also just a week old, and had until now never seen a headset!).
The other side could well understand me well, but to hold the phone in the normal operating 30cm away from the head is louder than what comes out on the headset directly in the ear (without hands-free function!) - I could hear a faint whisper.
Originally I had the previous reviews that describe this problem, rather than "Well, what is already soft or loud" dismissed - but as I said: the phone itself (without handsfree) is louder - even far away from the head!
My recommendation: rather buy something else - I just ordered the "Plantronics M175 headset" - the producer I know from my company and am there totally thrilled. Is more expensive, but I think it will just work better (and has even more functions).
In this headset I was annoyed that I time (to wait for delivery, testing, and send it back and wait until a new headset there is) had to spend!
