Grandstream UCM6308A Audio IP PBX – Up to 1500 Users, 200 Concurrent Calls

A Complete Audio PBX for Large Organizations — Grandstream UCM6308A

If your organization needs to manage a large number of users, lines and calls from a single platform, the Grandstream UCM6308A is a powerful audio IP PBX supporting up to 1500 users and 200 concurrent calls, with built-in analog ports, the Wave app and management via GDMS.

Why Choose the UCM6308A?

The UCM6308A combines a powerful on-premise PBX with voice collaboration, messaging and remote-work tools, offering capacity suited to enterprises, hotels and service centers that need reliability and scalability without relying on per-feature licenses.

What Does It Offer?

• Up to 1500 SIP users.


• Up to 200 concurrent G.711 calls.


• Up to 150 concurrent SRTP calls.


• 8 FXS ports: for connecting analog phones or fax machines.


• 8 FXO ports: for connecting analog PSTN lines.


• Up to 9 audio conference rooms and 150 audio participants.


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


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


• UCM RemoteConnect: simplifies connectivity for remote users and devices.


• GDMS: for cloud-based provisioning, management and monitoring.


• API integration: with external systems such as CRM and PMS.


• Advanced security: Secure Boot, a unique certificate and SRTP/TLS/HTTPS encryption.


• High reliability: Hot Standby High Availability and dual local deployment support.

Key Technical Specifications

• Model: UCM6308A


• Type: Audio IP PBX


• Users: up to 1500


• Concurrent calls: up to 200


• Concurrent SRTP: up to 150


• FXS: 8


• FXO: 8


• Audio conferencing: up to 9 rooms / 150 participants


• Network: 3 × Gigabit Ethernet with PoE+


• Management: GDMS + Web UI


• Collaboration and remote work: Wave + UCM RemoteConnect


• System: based on Asterisk 16

Best Suited For

Large enterprises, hotels, call centers, large branches and facilities that need a high number of users along with SIP trunks, PSTN lines and analog devices.

Unify your organization's communications on a powerful, scalable voice platform — order the Grandstream UCM6308A from Catcher.