Grandstream UCM6304A Audio IP PBX – Up to 1000 Users, 150 Concurrent Calls

Flexible Audio IP PBX for Up to 1000 Users — Grandstream UCM6304A

The Grandstream UCM6304A is a practical solution for businesses and branches that need a high-capacity audio IP PBX with support for SIP trunks and analog lines, the Wave app, audio meetings and centralized management via GDMS.

Why Choose the UCM6304A?

The UCM6304A strikes a strong balance between capacity and cost, supporting up to 1000 users and 150 concurrent calls, with four FXS and four FXO ports, making it ideal for medium-sized businesses and large branches.

What Does It Offer?

• Up to 1000 SIP users.


• Up to 150 concurrent G.711 calls.


• Up to 120 concurrent SRTP calls.


• 4 FXS ports: for analog phones and fax machines.


• 4 FXO ports: for connecting PSTN lines.


• Up to 7 audio meeting rooms and 120 audio participants.


• Wave: for calls, messaging and audio meetings from a range of devices.


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


• GDMS and UCM RemoteConnect: for centralized management and remote work.


• API: for integration with CRM, PMS and external systems.


• Security and reliability: Secure Boot, SRTP/TLS/HTTPS and Hot Standby support.

Key Technical Specifications

• Model: UCM6304A


• Type: Audio IP PBX


• Users: up to 1000


• Concurrent calls: up to 150


• Concurrent SRTP: up to 120


• FXS: 4


• FXO: 4


• Audio meetings: up to 7 rooms / 120 participants


• Network: 3 × Gigabit Ethernet with PoE+


• Management: GDMS + Web UI


• Remote work: Wave + UCM RemoteConnect


• System: based on Asterisk 16

Best Suited For

Medium-sized businesses, branches, small and medium hotels, service centers and facilities that need a mix of IP phones and analog lines.

Upgrade your company's communications with a powerful, easy-to-manage audio platform — order the Grandstream UCM6304A from Catcher.