Telecommunications, Mixed Telecommunications, 1. USKY SIP Gateway as a VOIP Gateway, perfectly connect with original PBX(telephone system) or IPPBX, make or receive calls through the desktop phone, no habits changed. 2. Reduces the telephone call cost largely, the cheapest calling rates in the world. 3. Leading technology of SIP and PSTN integration in one device. 4. Linux operating system, more stable and safety. 5. All-In-One design, no ...