Central Grandstream UCM6300A Central Grandstream IP PBX UCM6300A allows companies to build powerful and scalable communications and collaboration solutions, characterized by an elegant streamlined shape, specially designed to meet the needs of businesses and companies that want to control their communications, and supports multiple features such as voice calls, video calls and conferences Video It allows employees to communicate via computers, mobile phone and video conferencing devices, in addition to supporting 250 users and supporting up to 50 simultaneous calls. Central Grandstream UCM6300A Features 250 Users, 50 Concurrent Calls- 1*USB 3.0, 1*SD card interface - 3 Gigabit Ports with PoE+- 3 meeting rooms and up to 50 parties -