Grandstream UCM6304A IP-PBX with 4 FXO, 4 FXS, 1000 Users

The Grandstream UCM6304A is an IP-PBX that gives growing organisations a single, on-premise platform for voice, video, and data communication. It supports up to 1000 extensions, so a business can add new staff or departments without swapping hardware or licenses. Four FXO ports connect the system to public phone lines, while four FXS ports keep fax machines and other legacy analog devices working alongside newer SIP endpoints.

Built on the proven Asterisk version 16 engine, the UCM6304A delivers call routing, voicemail, auto-attendant, and other core PBX features with the stability IT teams expect. Grandstream’s zero-configuration provisioning lets an administrator plug in a compatible desk phone or conference phone and have it appear on the network in seconds, which cuts deployment time for branch offices or seasonal expansions.

Remote and hybrid staff benefit from built-in instant messaging, audio conferencing, and browser-based web meetings that work on laptops, tablets, or mobile phones. Because these tools run directly on the appliance, there is no monthly fee for separate collaboration software.

Security sits at the centre of the design. Secure boot, unique device certificates, and support for TLS encryption protect every call and account from unauthorised access—an essential safeguard for healthcare providers, legal firms, and any company that handles confidential information.

An open API makes it straightforward to link the PBX with popular CRM or property-management systems, allowing call records and guest services to flow into existing workflows. The rack-mountable chassis fits neatly into a data closet or server rack, so the unit feels right at home in corporate headquarters, hotels, customer support centres, or multi-site retailers that prefer full control over their communications.

Highlights:

• Scales to 1000 users and 200 concurrent calls
• Four FXO and four FXS ports bridge analog lines and devices
• Powered by Asterisk version 16 for reliable telephony services
• Zero-configuration provisioning for Grandstream SIP endpoints
• Built-in voice, video, web meetings, and instant messaging
• Secure boot and unique certificates protect calls and accounts
• Open API supports integrations with CRM and PMS platforms
• Rack-mountable appliance for clean installation in IT closets or data centres