The Grandstream UCM6104 4-Port IP PBX is a compact and powerful communication solution for small to mid-sized businesses, integrating voice, video, data, and mobility features without the need for licensing fees. Supporting up to 500 users and 45 concurrent calls, it includes 4 FXO ports and 2 FXS ports, offering a reliable and easy-to-deploy VoIP system with wide SIP compatibility.

• Handles up to 500 users and 45 concurrent calls with 4 FXO and 2 FXS ports

• Zero configuration provisioning and automatic discovery of Grandstream SIP devices

• Built-in support for 3 conference bridges and 25 conference participants

• Features Gigabit LAN/WAN ports with PoE and 4GB onboard flash storage

• Works with most SIP phones and providers, supporting up to 50 SIP trunk accounts