A company by the name of CuPhone has introduced a simple USB adapter for using your regular phone as a Skype device. It is called the “Echo Free” USB-to-Phone Adaptor and you’ll find it pricing around $34.

The CuPhone “Echo Free” USB-to-Phone Adaptor plugs into the USB port of a PC, allowing “the user to plug his regular phone into the RJ11 port on the adaptor to make and receive either Skype or normal landline” calls. The adaptor has built-in echo cancellation technology to improve audio quality.