Grandstream UCM6304A

Overview

The Grandstream UCM6304A is an IP-PBX system designed to unify voice, video, and data communication for growing organizations. Supporting up to 1000 users and 200 concurrent calls, it provides a scalable solution that accommodates expanding teams without the need for additional hardware or licenses. With four FXO ports for connecting public phone lines and four FXS ports for legacy analog devices like fax machines, it bridges traditional telephony with modern SIP endpoints seamlessly.

Powered by the stable Asterisk version 16 engine, this appliance delivers essential PBX features such as call routing, voicemail, and auto-attendant. Its zero-configuration provisioning simplifies deployment by automatically recognizing compatible Grandstream SIP phones, making it ideal for branch offices or seasonal expansions. The system also includes built-in collaboration tools like instant messaging, audio conferencing, and browser-based web meetings, eliminating the need for extra software subscriptions.

Key features

• Scalable platform supporting up to 1000 users and 200 simultaneous calls, accommodating business growth without hardware changes
• Four FXO ports enable connection to traditional public phone lines, while four FXS ports maintain compatibility with analog devices such as fax machines
• Zero-configuration provisioning allows quick setup of Grandstream SIP endpoints, reducing IT workload and deployment time
• Integrated voice, video, web conferencing, and instant messaging tools support remote and hybrid workforces without additional fees
• Robust security features including secure boot, unique device certificates, and TLS encryption protect communications from unauthorized access
• Open API facilitates integration with CRM and property management systems, streamlining workflows and call record management
• Rack-mountable design fits neatly into data closets or server racks, ensuring a clean and professional installation in corporate or multi-site environments

Key specs

• User capacity: up to 1000 users
• Concurrent calls: up to 200
• FXO ports: 4
• FXS ports: 4
• PBX engine: Asterisk version 16
• Provisioning: zero-configuration for Grandstream SIP endpoints
• Security: secure boot, unique device certificates, TLS encryption
• Form factor: rack-mountable appliance

Connectivity and compatibility

The UCM6304A supports a mix of analog and IP telephony, making it suitable for businesses transitioning from traditional phone systems to modern VoIP solutions. The FXO ports connect to public switched telephone networks, while the FXS ports allow legacy devices to remain operational alongside SIP phones. Its compatibility with Grandstream SIP endpoints ensures seamless integration and easy expansion.

• Four FXO ports for PSTN line integration
• Four FXS ports for analog device support
• Supports Grandstream SIP phones with automatic provisioning
• Open API for integration with CRM and property management software

Performance and reliability

Built on the proven Asterisk 16 platform, this IP-PBX delivers reliable telephony services with features like call routing, voicemail, and auto-attendant. The system’s security measures protect sensitive communications, making it suitable for industries with strict privacy requirements such as healthcare and legal services. Its ability to handle 200 concurrent calls ensures smooth operation even during peak usage.

Ideal uses and environments

This IP-PBX is well suited to medium and large businesses, including corporate headquarters, hotels, customer support centers, and multi-site retailers. It supports remote and hybrid work models through built-in collaboration tools, making it a strong choice for organizations that need a unified communication platform without recurring software fees. The rack-mountable design fits well in IT closets or data centers, maintaining a professional and organized infrastructure.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

Deliveries are handled by major carriers such as USPS, UPS, and FedEx. Estimated delivery times are displayed at checkout and may vary depending on service level and location. Please note that these are estimates and can be affected by weather, holidays, or carrier volume. Once your order ships, you’ll receive a tracking number for real-time updates from pickup to final delivery.

Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, with tags, manuals, accessories, and original, unaltered packaging. Any item kept will be deducted from the refund. Start a return by sending us an email. Items sent back without approval may be refused or returned to the sender.

Some items are not returnable: opened TVs/combos/monitors 37″+, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method; allow 5–7 business days for the credit to post. Shipping, handling, customs duties, and import taxes are nonrefundable. If an item is used, incomplete, or not in original condition, a 30% restocking fee may apply. Direct exchanges are not offered; purchase the replacement and return the original for a refund.

We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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