["Used in combinationwith Yealink IP Conference Phone CP860/CP920, the CPN10, as a new product designed by Yealink, is a PSTN box to meet the demands in some countries and areas which are still using the public switched telephone network (PSTN). With this PSTN box CPN10, our Yealink CP860/CP920 can both support the conferencing call based on SIP protocol and PSTN. With one PSTN cable in your meeting room, you can easily connect the PSTN box CPN10 with Yealink professional conference phone CP860/CP920 and start up your local three-way conference. Meanwhile, plus CP860's/CP920's HD audio quality, build-in 3 microphone array, full-duplex technology, acoustic echo canceling technology as well as its rich call handling features, such as USB call recording, linkage to mobilephones or PCs, you can conveniently enjoy the conferencing call easily with excellent speech quality in your meeting room. Features", "Support Yealink IPConference Phone CP860/CP920", "Plug and play", "Easy to use", "No additional power needed", "USB call recording", "Support up to 2 cascaded CPN10 to setup PSTN conference ?? Specifications ?? Features", "USB call recording", "Support up to 2 cascaded CPN10", "Support both SIP and PSTN modes", "Linkage to mobile phones or PCs Package includes:", "1 x PSTN Box CPN10", "1 x 3m PSTN Cable", "1 x Double Side Tape", "1 x Quick Start Guide Physical features:", "1 x USB 2.0 port", "1 x RJ11 port", "Dimension (W*D*H): 73mm*48m*15mm", "Operating humidity: 10~95%", "Storage temperature: -10~50°C", "Operating temperature: 0~50°C Package features", "Qty/CTN: 40PCS", "N.W/CTN: 4.0 kg", "G.W/CTN: 5.0kg", "Gift box size: 131mm*90mm*35mm", "Carton Meas: 390mm*220mm*262mm"]