Skytone RST401 USB Skype Telephone Gateway Remote Dial In/fwrd = Yealink USB-B3G Gateway for Skype calls from a remote location Make/Receive both Skype (Internet) calls and regular PSTN calls Phone rings for all incoming Skype (Internet) and PSTN calls Enables switching between Skype (Internet) and Regular PSTN calls Same as Yealink USB-B3G