Grandstream UCM6308 IP PBX

Grandstream UCM6308 IP PBX is a high-capacity enterprise-grade unified communication platform designed for large organizations that require scalable VoIP telephony, SIP trunking, advanced conferencing, and hybrid analog-IP integration. It delivers a complete business communication solution by combining voice calling, messaging, mobility, remote collaboration, and centralized management in a single appliance. Supporting up to 3000 users and 450 concurrent calls, the UCM6308 is built for mission-critical deployments such as large corporate offices, institutions, call centers, and multi-site enterprises that need reliable, secure, and scalable communication infrastructure.

Product Features

High-Capacity Enterprise Communication Platform

The UCM6308 supports up to 3000 registered users and 450 simultaneous calls, making it suitable for high-density communication environments with heavy call traffic and large user bases.

Integrated 8 FXO and 8 FXS Ports

It includes 8 FXO ports for PSTN connectivity and 8 FXS ports for analog devices such as legacy phones and fax machines, enabling seamless hybrid telephony integration.

Unified Voice, Messaging, and Collaboration

The platform combines VoIP calling, instant messaging, audio conferencing, and collaboration tools into one centralized system for improved business communication efficiency.

Advanced Audio Conferencing and Meeting Support

Built-in conferencing capabilities support large-scale audio meetings with up to 300 participants and enable structured call management for enterprise teams.

Remote Access and Mobility Support

Grandstream Wave applications allow users to connect from mobile, desktop, and web platforms, ensuring communication continuity for remote and hybrid work environments.

Zero-Touch Provisioning for SIP Devices

Automated provisioning simplifies deployment of compatible Grandstream SIP endpoints, reducing configuration time and IT workload.

Enterprise-Grade Security Protection

Security features include secure boot, TLS and SRTP encryption, randomized default credentials, and unique device certificates to protect communications and system access.

Integrated Gigabit Networking with NAT Router

Three Gigabit Ethernet ports with integrated NAT router functionality provide flexible deployment options and high-speed network performance.

Cloud and Remote Management Support

The system supports Grandstream Device Management System (GDMS) and UCM RemoteConnect for centralized monitoring, configuration, and remote administration.

Asterisk-Based Open Telephony Architecture

Built on the Asterisk platform, the UCM6308 supports SIP interoperability, API integration, CRM connectivity, and third-party communication systems.

Product Specifications

• Product Name: Grandstream UCM6308 IP PBX
• Model: UCM6308
• System Type: Enterprise Unified IP PBX Appliance
• Communication Type: Voice and collaboration platform
• Supported Users: Up to 3000 users
• Concurrent Calls: Up to 450 simultaneous calls
• Secure SRTP Calls: Up to 300 calls (varies by configuration)
• Conference Capacity:
  • Up to 300 participants (audio conferencing)
  • Multiple conference rooms supported
• FXO Ports:
  • 8 x RJ11 FXO ports
• FXS Ports:
  • 8 x RJ11 FXS ports
• Network Interfaces:
  • 3 x Gigabit auto-sensing Ethernet ports
• NAT Router Support: Yes
• USB Ports:
  • 2 x USB 3.0 ports
• Storage Expansion:
  • SD card slot
• Display:
  • 320 x 240 color LCD display
• Telephony Platform:
  • Asterisk version 16
• Audio Codecs Supported:
  • Opus
  • G.711 A-law/U-law
  • G.722
  • G.729
  • iLBC
  • GSM
• Fax Support:
  • T.38 fax protocol
• Security Features:
  • Secure boot
  • TLS encryption
  • SRTP encryption
  • HTTPS and SSH access
  • Unique device certificates
  • Randomized default passwords
• QoS Support:
  • Layer 2 QoS (802.1Q, 802.1p)
  • Layer 3 QoS (DiffServ, ToS, MPLS)
• Provisioning:
  • Zero configuration provisioning for Grandstream SIP devices
• Remote Management:
  • GDMS cloud platform support
  • UCM RemoteConnect
• Integration Support:
  • CRM systems
  • PMS systems
  • API-based integrations
• Deployment Type:
  • On-premise IP PBX with cloud-enabled management
• Mounting Options:
  • Rack mount and desktop installation
• Color: Black
• Warranty: Manufacturer limited warranty