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
2.03 Gbps wireless throughput and 4 Gigabit wireline ports 5GHz 4×4:4 MU-MIMO
Supports up to 200 concurrent Wi-Fi client devices
Advanced QoS to ensure real-time performance of low-latency applications
Anti-hacking secure boot and critical data/control lockdown via digital signatures, unique security certificate/random default password per device
Self-power adaptation upon auto detection of PoE or PoE+
Embedded controller can manage up to 30 local GWN series APs;
GWN.Cloud offers unlimited AP management; GWN Manager offers premise-based software controller
Grandstream UCM6308 IPPBX Support up to 1500 Users and 200 Concurrent calls
Connects and constantly monitors two UCM6510 together for high availability
Smart failover solution that automatically switches to a hot-standby secondary UCM6510 if the primary one fails
The Grandstream GHP621 is a compact IP phone designed for hotel rooms and similar environments, featuring 2 SIP lines, PoE support, speed dial keys, a customizable faceplate, and easy remote management via GDMS.
Grandstream UCM6302A IPPBX Support up to 500 Users and 75 Concurrent calls
WS-POE-12-48v240w passive 12 port POE Injector for 12 IP cameras, VOIP phones or Access Points 
8-Port Passive Poe Injector 
