Thanks for the report Kalle.
This looks like a really good option if you can find one that fits your budget. It is hard to find them at an affordable price here in Canada, and they are very expensive to buy new, I think.
As I understand it, DECT is specifically for digital voice communication.
I have heard that these plantronics headsets also have very good noise cancelling technology, so hopefully this will work well even with a certain amount of background noise.