Grandstream UCM6304A Audio Series IP PBX

Grandstream UCM6304A Audio Series IP PBX is a high-capacity unified communication platform designed for medium and large businesses that require advanced VoIP telephony, SIP trunking, audio conferencing, and hybrid communication management. Built to support modern enterprise communication environments, the UCM6304A combines voice calling, instant messaging, mobility, remote collaboration, and centralized communication management into a single scalable solution. With support for up to 1000 users and 150 concurrent calls, integrated FXO and FXS interfaces, cloud management compatibility, and enterprise-grade security features, the UCM6304A delivers reliable business communication for corporate offices, institutions, hotels, and distributed branch deployments.

Product Features

Supports Up to 1000 Users and 150 Concurrent Calls

The UCM6304A is engineered for enterprise scalability, supporting up to 1000 registered users and 150 simultaneous calls for high-demand communication environments.

Integrated FXO and FXS Analog Interfaces

Equipped with 4 FXO ports and 4 FXS ports, the system supports PSTN lines, analog telephones, fax machines, and cordless phones, enabling hybrid analog and IP telephony deployment.

Unified Communication and Collaboration Platform

The platform integrates VoIP calling, instant messaging, audio conferencing, web meetings, analytics, intercom support, and remote collaboration into a centralized communication system.

Built-In Audio Conferencing and Web Meeting Support

Integrated conferencing tools allow businesses to host secure multi-party meetings accessible through SIP phones, desktops, web browsers, and mobile devices.

Free Wave App for Remote Communication

Grandstream Wave applications provide remote access for voice calls, messaging, and collaboration across Android, iOS, desktop, and web platforms.

Zero-Touch Provisioning for SIP Devices

Automatic provisioning support simplifies deployment and configuration of compatible Grandstream SIP endpoints and IP communication devices.

Advanced Security and Encryption

Enterprise-grade protection includes secure boot, SRTP and TLS encryption, unique certificates, randomized default passwords, and secure remote connectivity features.

Gigabit Networking with Integrated PoE+

Three Gigabit auto-sensing Ethernet ports with integrated PoE+ provide high-speed networking and flexible deployment options.

Cloud Management and Remote Access

Support for Grandstream Device Management System (GDMS) and UCM RemoteConnect enables centralized cloud management, monitoring, and secure remote access.

Asterisk-Based Open Telephony Platform

The PBX is built on the Asterisk version 16 telephony framework, enabling SIP interoperability, CRM integration, PMS integration, and API-based customization.

High Availability and Reliability Support

The UCM6304A supports hot standby high-availability deployment and dual local deployment for improved business continuity and system reliability.

Product Specifications

• Product Name: Grandstream UCM6304A Audio Series IP PBX
• Model: UCM6304A
• System Type: Unified IP PBX Appliance
• Communication Type: Audio-only unified communication platform
• Supported Users: Up to 1000 users
• Concurrent Calls: Up to 150 simultaneous calls
• Conference Capacity: Multiple conference rooms with up to 150 participants
• FXO Ports:
  • 4 x RJ11 FXO ports
• FXS Ports:
  • 4 x RJ11 FXS ports
• Network Interfaces:
  • 3 x Gigabit auto-sensing RJ45 Ethernet ports
• PoE Support: Integrated PoE+
• NAT Router Support: Yes
• USB Interfaces:
  • 2 x USB 3.0 ports
• Storage Expansion:
  • 1 x SD card interface
• Display:
  • 320 x 240 color touchscreen LCD
• Audio Codec Support:
  • Opus
  • G.711 A-law/U-law
  • G.722
  • G.729
  • iLBC
  • GSM
• Fax Support:
  • T.38 fax
• Security Features:
  • Secure boot
  • TLS encryption
  • SRTP encryption
  • HTTPS and SSH support
  • Unique security certificates
  • Randomized default passwords
• QoS Support:
  • Layer 2 QoS (802.1Q, 802.1p)
  • Layer 3 QoS (DiffServ, ToS, MPLS)
• Provisioning Support:
  • Zero-touch provisioning
  • Auto-discovery for SIP endpoints
• Remote Management:
  • GDMS cloud management
  • UCM RemoteConnect
• Telephony Platform:
  • Asterisk version 16
• Third-Party Integration:
  • CRM integration
  • PMS integration
  • API support
• Supported Platforms:
  • Windows
  • macOS
  • Android
  • iOS
  • Web browsers
• Power Input:
  • 100–240V AC
  • 12V DC power adapter
• Mounting Options:
  • Desktop
  • Wall mount
• Color: Black
• Warranty: Manufacturer limited warranty