The Grandstream UCM6204 provides a unified solution for the communication needs of businesses. The UCM6204 IP PBX appliance combines enterprise-grade voice, video, data, and mobility features in an easy-to-manage solution. The Grandstream UCM6204 is part of the UCM6200 series, building on the platform set by the UCM6100 series, offering more features and functionalities. Grandstream UCM6204 Key Features FXO Ports: 4 FXS Ports: 2 Gigabit Ports: 2 Users: 500 Concurrent Calls: 45 Conference Bridges: 3 Attendees p/ bridge: 25 This IP PBX series allows businesses to unify multiple communication technologies, such as voice, video calling, video conferencing, video surveillance, data tools, mobility options and facility access management onto one common network that can be managed and/or accessed remotely. The secure and reliable Grandstream UCM6200 series delivers enterprise-grade features without any licensing fees, costs-per-feature or recurring fees.