Grandstream UCM6304 IP PBX – 2000 Users, 300 Concurrent Calls, 4 FXO Ports

The Grandstream UCM6304 is a powerful enterprise-grade IP PBX system that brings scalable and secure unified communications to medium and large businesses. It combines voice, video, messaging, data, mobility, and security into a single easy-to-manage platform.

Designed to meet the demands of growing organizations, the UCM6304 supports up to 2000 registered users and 300 concurrent SIP calls, making it perfect for high-volume environments such as corporate offices, universities, call centers, and hospitals.

This model features 4 FXO ports for PSTN integration and 2 FXS ports for analog phone connections. It also includes 4 Gigabit network ports, a NAT router, and built-in firewall functionality for added security. The system is powered by a high-performance processor, ensuring smooth handling of large-scale VoIP traffic without compromising on quality.

With native support for video conferencing, web meetings, and collaboration tools, the UCM6304 integrates perfectly with Grandstream’s GVC series and the Wave app. This allows staff to connect remotely via mobile or desktop, facilitating efficient hybrid or remote work environments.

The UCM6304 offers zero-licensing fees, reducing operational costs while maintaining a full suite of professional features such as:

• Call routing

• Multi-level IVRs

• Voicemail-to-email

• Call queues

• Call recording

• Hot desking

• Built-in conferencing bridge

Security is at the forefront, with TLS and SRTP encryption, automated backups, and high availability failover. You also get access to GDMS (Grandstream Device Management System), enabling centralized configuration and monitoring via the cloud.

With API integration support, you can connect the PBX to third-party CRMs and platforms, allowing deep integration into your business workflow.

Whether you are building a brand-new VoIP network or upgrading your legacy PBX, the Grandstream UCM6304 delivers reliability, performance, and flexibility—all without monthly subscription fees.

🔹 Key Features of grandstream ucm6304:

• Supports up to 2000 users and 300 concurrent calls

• 4 FXO ports, 2 FXS ports for PSTN/analog integration

• 4 Gigabit RJ45 ports + NAT router

• Built-in video conferencing and web meetings

• Full unified communications suite – voice, video, chat, mobility

• TLS/SRTP encryption, failover, backup & restore

• Compatible with Grandstream IP Phones, Wave app, and SIP softphones

• Centralized management via GDMS

• No license fees – feature-rich out of the box

The Grandstream UCM6304 is a solid, scalable choice for companies aiming to centralize communication under one intelligent and secure platform.

Check this also

More important links:

• Official Grandstream UCM6304 Page

• UCM6304 Datasheet PDF

• GDMS Cloud Portal