Grandstream UCM6308 IP PBX | 3000 Users & 450 Calls | 8 FXS/FXO Ports

Grandstream UCM6308: Enterprise‑Grade Audio/Video Communication Hub

The Grandstream UCM6308 is the most powerful model in the UCM6300 series, designed to serve as the central communication hub for large enterprises, call centers, and multi‑national organizations. Based on the reliable Asterisk version 16 open‑source telephony operating system, it provides a massively scalable platform that centralizes all essential business communications, including voice calls, video calling, video conferencing, web meetings, instant messaging (IM), mobility features, facility access, and intercoms onto one powerful network.

Key Features & Specifications

Maximum Capacity for Large Enterprises – Supports up to 3000 users, 450 concurrent G.711 calls, and 300 concurrent SRTP encrypted calls.

Extensive Analog Connectivity – Includes 8 FXO ports for connecting to traditional PSTN telephone lines and 8 FXS ports for connecting analog phones or fax machines. All ports have lifeline capability to maintain basic phone service during a power outage. Port count can be expanded further by peering with external FXS/FXO gateways.

Superior Audio & Video Quality – Features the Full‑Band Opus voice codec and supports H.265, H.264, H.263, H.263+, and VP8 video codecs. Advanced jitter resilience technology maintains clear call quality even with up to 50% packet loss.

Seamless Collaboration – Comes with a built‑in platform for audio conferencing, video conferencing, and web meetings, accessible from computers, SIP endpoints, or the free Wave App on desktop, web, and mobile. Supports unlimited meeting rooms with up to 25 simultaneous public meeting rooms and up to 300 simultaneous participants combined.

Enterprise‑Grade Networking – Three Gigabit auto‑sensing RJ45 ports with integrated PoE+ and NAT router support. Includes USB 3.0 and an SD card interface.

Secure & Reliable – Provides advanced security with secure boot, unique certificate, and random default passwords. Supports hot standby high availability to ensure business continuity.

Remote Work Ready – Automated NAT firewall traversal (UCM RemoteConnect) and GDMS cloud management platform facilitate secure remote connections for distributed teams and simplified system administration from anywhere.

Easy Management – Zero‑configuration provisioning for Grandstream SIP endpoints. Full API available for third‑party integrations, including CRM and PMS platforms.

Why Choose the UCM6308 for Your Business?

For very large enterprises, high‑volume call centers, or organizations with extensive legacy analog infrastructure, the UCM6308 offers the highest capacity, feature richness, and reliability in the series.

• Complete UC Solution – Replaces separate systems for VoIP, analog lines, video conferencing, and messaging.

• Maximum Scalability – Supports up to 3000 users with ample room for aggressive business growth.

• Flexible Integration – The available API allows for seamless connection with third‑party applications.

• Unified Management – Manage the entire system through a single, intuitive interface.

The Grandstream UCM6308 delivers a comprehensive, secure, and highly reliable business communication platform tailored for the largest organizations.