Detailed Product Description: The call box can be an assistant telephony device with answering machine, even connecting Skype and PSTN as an instant messenger and PSTN bridge using call forwarding mechanism, performing Skype-out without any subscription, and whatever VOIP application you might think of it. The extension of Skype P2P network just simply bridge the PSTN phone call, supporting PC-to-phone, phone-to-PC and phone-to-phone voice transmission. Also a three-way conference with handset, cell phone and the other side of Skype buddy can be realized in between. Key Features: 1) SKG-100U is a USB gateway to support Skype 2) Advance forward function: can forward a Skype call to a Local PSTN 3) Advance forward function: can forward a PSTN call to Skype 4) Third part call in indication: when Phone is on line, third part call in, there will be a indication tone in the phone 5) Call hold function: when hear indication tone, press "*" to hold the current call and answer the third part call, then press "*" to continue the current call 6) Conference call: when hear indication tone, if you want to launch a conference call, press "#", Skype, phone and PSTN can setup a conference call 7) No power needed 8) Hardware echo cancellation greatly improve voice quality 9) Small size Hardware characteristics: 1) USB interface 2) Support USB1.1 3) FXS interface, interface with an analog phone, RJ11 4) FXO interface, interface with a PSTN line, RJ11 Regulatory compliance: 1) FCC part 15 class B 2) CE mark Indicator lights: 1) USB status LED-red 2) Phone indication LED-green 3) Line indication LED-green Operating temperature: 41 to 113篎 (5 to 45篊) Storage temperature: -13 to 185篎 (-25 to 85篊) Relative Humidity: 10 to 90% non- condensing Box contents: UTA Unit Color: White USB cable 1.0m cord CD driver setup