Grandstream UCM6308A

Here’s an enhanced overview of the Grandstream UCM6308A—the audio-only variant of the UCM6308, optimized for organizations relying entirely on voice communications:

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   Key Specifications & Features

User & Call Capacity

• Supports up to 1,500 SIP users and 200 concurrent calls (150 encrypted with SRTP) 

• Built-in audio conferencing: 9 conference rooms supporting up to 150 participants

Analog Ports

• 8 FXO ports for PSTN line integration

• 8 FXS ports for analog phones or fax machines, all with emergency lifeline support 

Networking & Expansion

• 3× Gigabit Ethernet ports with PoE+ and capable of router/NAT/firewall operations 

• 2× USB‑A 3.0 ports and 1× SD card slot for recording and storage 

• Front 320×240 color touchscreen for system setup and management 

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   Unified Communications & Security

• Zero‑touch provisioning for Grandstream SIP endpoints

• Includes complimentary features: IVR, call queues, auto-attendant, call logging, fax-to-email, and instant messaging via the Wave app 

• Enterprise-grade security: secure boot, unique certificates, SRTP, TLS, HTTPS; includes Hot-Standby High-Availability support 

• Managed via GDMS for centralized or remote provisioning and monitoring