Grandstream UCM6304A Audio IP PBX — 750 Users, 200 Concurrent Calls, 3 Gigabit Ports, PoE+, Audio/Web Conferencing, Wave App, Asterisk-Based UC Platform

The UCM6304A is part of the Grandstream UCM6300 Audio Series, a robust Unified Communication & Collaboration platform designed to centralize and streamline all business communication tools. Grandstream UCM6304A it also unifies voice, instant messaging, voice meetings, audio/web conferencing, mobility, security, analytics, intercoms, and more — with reliable, on-premise performance and cloud-enabled remote access through UCM RemoteConnect.

Grandstream UCM6304A is supporting up to 750 users and 200 concurrent calls, this appliance includes a built-in instant messaging, audio/web conferencing server, and integrates with the free Wave App for desktop, mobile, and web-based communication and meetings.

Grandstream UCM6304A is built on Asterisk 16, the UCM6304A offers enterprise-grade features, including zero-configuration provisioning of Grandstream SIP endpoints, advanced security protection (TLS, SRTP, HTTPS), high-availability failover options, and powerful call management capabilities with custom IVRs, call queues, and call recording.

Grandstream UCM6304A comes with 3 Gigabit PoE+ ports, an LCD touchscreen interface, and extensive codec and security protocol support, the UCM6304A is an ideal solution for growing businesses requiring a scalable, secure, and flexible unified communication system.

🎯 Key Features:

• Supports up to 750 users and 200 concurrent calls

• 3 Gigabit network ports (switched, routed, or dual mode) with PoE+

• Integrated NAT router with firewall and fail2ban security

• Built-in audio/web conferencing: 3 bridges, up to 50 participants per room

• Instant Messaging & Wave App for voice and IM via desktop, web, Android, and iOS

• Zero-config provisioning for Grandstream SIP endpoints

• Advanced security: Secure boot, random default passwords, TLS, SRTP, HTTPS, SSH

• API for third-party integrations (CRM, PMS, and more)

• Codec support: Opus, G.711, G.722, G.726, G.729, iLBC, GSM, T.38 for Fax-over-IP

• QoS support at Layer 2 and Layer 3

• UCM RemoteConnect cloud service for secure, remote access without manual NAT configuration

• Fully customizable IVR (up to 5 layers) and multi-language support

• Call center features: multiple call queues, skills-based ACD, in-queue announcements

• Up to 200 SRTP-encrypted concurrent calls

• Supports up to 1500 users and up to 200 concurrent calls
• Zero configuration provisioning of Grandstream SIP endpoints
• Built-in Instant Messaging (IM), Audio Conferencing & Web Meetings platform that supports access from computers, mobile devices, and SIP endpoints
• Free Wave App allows easy voice & Instant Messaging (IM) communications using desktops, Web, and Android/ iOS devices
• API available for third-party integrations, including CRM and PMS platforms
• Advanced security protection with secure boot, unique certificate and random default password to protect calls and accounts
• Three Gigabit auto-sensing RJ45 network ports with integrated PoE+ and support NAT router
• Automated NAT firewall traversal service facilitates secure remote connections
• Enhanced reliability with support for Hot Standby High-Availability and local dual deployment
• Supports Full-Band Opus voice codec, jitter resilience up to 50% packet loss
• Compatible with GDMS for cloud setup, management, and monitoring
• Based on Asterisk* version 16 open source telephony operating system