Capacity & Telephony:
Users: Supports up to 800 users
Concurrent Calls: Handles up to 100 concurrent calls
FXO Ports: 8 RJ11 ports for analog PSTN lines
FXS Ports: 2 RJ11 ports for analog phones or fax machines with lifeline support
Grandstream

Network & Connectivity:
Network Ports: Dual Gigabit RJ45 ports with integrated PoE Plus (IEEE 802.3at)
Peripheral Ports:
1 USB port
1 SD card slot for call recording and backups
Display: 128×32 pixel graphic LCD with navigation buttons

Audio & Video Codecs:
Audio Codecs: G.711 (μ-law/a-law), G.722, G.723.1, G.726, G.729A/B, iLBC, GSM, Opus
Video Codecs: H.264, H.263, H.263+
Fax Support: T.38 Fax over IP

Security & Management:
Security Protocols: SRTP, TLS, HTTPS, SSH
Provisioning: Zero Configuration for Grandstream SIP endpoints
Remote Management: Web-based interface with multi-language support

PBX Features:
IVR (Auto Attendant): Supports up to 5 levels
Conference Bridges: Up to 6 bridges with 32 participants each
Call Recording: Built-in server with web access
Call Detail Records (CDR): Tracks phone usage by line, date, etc.
Voicemail & Fax to Email: Supported
Call Queue Management: Efficient handling of incoming calls

Physical & Environmental:
Dimensions: 440 x 185 x 44 mm
Weight: Approximately 2.23 kg
Mounting Options: Rack-mountable or desktop placement

Power Supply: 12V DC, 1.5A or via PoE+
Operating Conditions: 0°C to 40°C, 10% to 90% (non-condensing)