Grandstream / UCM6308A / IPPBX 8 FXO Port 8 FXS Port 1500 users 200 Concurrent Call Gateway

The Grandstream UCM6308A is a robust, full-featured IP PBX system tailored for large businesses, enterprise branches, and organizations with high-volume communication needs. As part of Grandstream’s UCM6300 series, the UCM6308A delivers a complete unified communications solution—combining voice, video, messaging, conferencing, and mobility—all in a single appliance, with no licensing fees or per-user costs.

This powerful IP PBX supports up to 3000 users and 450 concurrent calls, making it ideal for large deployments and businesses that require scalable, secure, and highly available communications infrastructure. The UCM6308A offers seamless integration with analog devices via 8 FXO ports (PSTN lines) and 8 FXS ports (for analog phones and fax machines), in addition to SIP trunking for modern VoIP connectivity.

Key Features:

High User and Call Capacity

• Supports up to 3000 users
• Handles up to 450 concurrent SIP calls
• Perfect for large enterprises, multi-location operations, and call centers

All-in-One Unified Communications

• Voice, video, chat, voicemail, video conferencing, presence, and more
• Built-in multi-party conferencing features and WebRTC integration
• Voicemail-to-email, auto-attendants (IVR), ring groups, call queues, and advanced call routing

Analog & Digital Integration

• 8 FXO ports for PSTN line connections
• 8 FXS ports for analog phones and fax machines
• Compatible with SIP trunks and a wide range of IP phones

Enterprise-Grade Security

• Advanced encryption protocols: TLS, SRTP, HTTPS
• Secure boot, Fail2Ban, blacklisting, and intrusion detection
• Granular user permissions and access control

Cloud and Remote Management

• Remote NAT traversal via UCM RemoteConnect cloud service
• Supports Grandstream Wave for mobile and desktop communication
• Fully manageable through Grandstream Device Management System (GDMS)

Seamless Ecosystem Integration

• Plug-and-play with Grandstream IP phones, video conferencing endpoints, intercoms, and gateways
• Compatible with third-party SIP devices
• Unified directory and centralized provisioning

Technical Specifications:

Ideal Use Cases:

• Large enterprise offices and corporate headquarters
• Multi-site businesses requiring centralized communication
• Government agencies, educational institutions, and hospitals
• Call centers and customer service departments

Why Choose the Grandstream UCM6308A?

The Grandstream UCM6308A IP PBX provides an enterprise-ready communication platform that is powerful, secure, and cost-effective. With support for thousands of users, advanced telephony features, remote access tools, and seamless integration with Grandstream’s ecosystem, it eliminates the need for third-party licensing and recurring subscription costs. Whether you’re upgrading from a legacy system or building a future-proof communication infrastructure, the UCM6308A delivers the scalability, flexibility, and reliability your business demands.