We have a new install with a mix of WiFi phones, desk phones and 3CX SoftPhones. All are working well and have good sound quality except the 3CX SoftPhones. These are ok (but as good as the phones) with a wired headset, but if we use bluetooth headsets we get terrible feedback and echo. We have 3 different headsets on 3 different laptops (1 XP, 1 Vista and 1 Windows 7) all are running version 4.9759 of the SoftPhone which I believe is the latest version. The headsets are all high quality Plantronics Voyagers with noise reduction and 2 of the laptops have upgraded bluetooth dongles. Has anyone else experienced this? is it a Windows, SoftPhone or a Bluetooth issue? Gary.