The Grandstream UCM6304A 4-Port Audio IP PBX delivers a unified communication platform tailored for voice, instant messaging, and web-based audio meetings across desktop, mobile, and SIP devices. Built for performance and reliability, it supports up to 1,500 users and 200 concurrent calls with robust security, high availability, and seamless integration capabilities.

• Handles up to 1,500 users and 200 concurrent voice sessions

• Four RJ11 FXO ports and three Gigabit RJ45 ports with PoE+ support

• Built-in platform for instant messaging, voice conferencing, and web meetings

• Wave app support for Android, iOS, web, and desktop voice and messaging communication

• High availability features with secure boot, dual deployment, and automated NAT firewall traversal