The Grandstream UCM6304 is an enterprise-grade IP PBX that supports up to 2,000 users and 300 concurrent calls, offering a unified communication platform with built-in voice, video, meetings, chat, mobility, and advanced security—ideal for scalable business collaboration.
The Grandstream CloudUCM Plus is a cloud-based PBX solution for small and growing businesses. It supports up to 50 extensions and 16 simultaneous calls, with built-in meetings, messaging, and CRM integration—all managed securely without hosting fees.
128×384 backlit LCD display
20 programmable dual-color buttons per module, 2 pages per module (40 contacts total)
BLF/speed dial
Daisy-chain up to 4 modules for up to 160 contacts/extensions
BLA (bridged line appearance)/SC
Full-duplex speakerphone with HD acoustic chamber, advanced acoustic echo cancellation, and microphone beamforming array
12 omnidirectional microphones with MMAD (Multichannel Microphone Array Design)
Supports 5m pickup range, and can be paired with two GMD1208 desktop wireless microphones up to 20m away for full-room coverage
10/100/1000Mbps network port with PoE+ and dedicated media port for collaborate
Integrated Bluetooth 5.0 support
Integrated Wi-Fi 6, Dual-band 2.4 & 5GHz with 802.11 a/b/g/n/ac/ax
Supports 12-party conferences
ZL-Bracket for 180Kg EM Lock-Use with Inward Door 
120 DB Outdoor Burglar Alarm Siren With Flash For Any Control Panel 
