Grandstream UCM6304 IP PBX – Up to 2000 Users, 300 Concurrent Calls

Scalable Unified Communications IP PBX for up to 2000 Users — Grandstream UCM6304

The Grandstream UCM6304 is a central business communications platform that brings together calling, extension management, meetings, the Wave app and remote work, with capacity for up to 2000 users and 300 concurrent calls.

Why Choose the UCM6304?

The UCM6304 provides an on-premise UCM system without the need to build several separate systems, with call management, recording, IVR, call queues, collaboration via Wave and integration with external systems.

What Does It Offer?

• Up to 2000 SIP users.


• Up to 300 concurrent G.711 calls.


• Up to 200 concurrent SRTP calls.


• 4 FXS ports and 4 FXO ports: to connect analog devices and PSTN lines directly.


• Meetings: up to 15 concurrent public rooms with a maximum of 200 participants in total.


• Wave: for calls, messaging and meetings from desktop, web and mobile.


• Advanced call management: IVR, call queues, ring groups, recording, voicemail, routing and CDR logs.


• 3 Gigabit Ethernet ports: with PoE+ and NAT router support.


• GDMS and UCM RemoteConnect: for management and remote access.


• API: for integration with CRM, PMS and business platforms.


• Enterprise security: Secure Boot, unique certificate and SRTP/TLS/HTTPS.


• Asterisk 16 based.

Key Technical Specifications

• Model: UCM6304


• Type: Unified Communication IP PBX


• Users: up to 2000


• Concurrent calls: up to 300


• Concurrent SRTP: up to 200


• FXS: 4


• FXO: 4


• Meetings: up to 15 rooms / 200 participants


• Network: 3 × Gigabit Ethernet with PoE+


• Management: GDMS + Web UI


• Remote access: Wave + UCM RemoteConnect

Best Use

Companies and organizations that need voice, video, meetings and extension management from a single platform.

Upgrade your organization's communications with a flexible central platform — order the Grandstream UCM6304 from Catcher.