IP PBXs UCM6200 Series UCM6202 and UCM6204 support up to 500 users and 50/75 concurrent calls, UCM6208 supports up to 800 users and 100 concurrent callsAuto Discovery and Zero Configuration of Grandstream SIP endpoints Order Now UCM6300 Series Supports up to 3000 users and up to 450 concurrent calls Zero configuration provisioning of Grandstream SIP endpoints Built-in conferencing & meetings platform; supports desktop, Wave app, and SIP endpoints Order Now UCM6510 Supports up to 2000 SIP endpoint registrations, up to 200 concurrent calls and up to 64 conference attendees 1GHz quad-core Cortex A9 processor 1GB DDR3 Ram, 32GB Flash 1 Integrated T1/E1/J1 interface, Order Now HA100 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 Order Now IP Phones Basic Phones GXP1610/GXP1615 1 SIP account, 2 line keys, 3-way conferencing, 3 XML programmable context-sensitive soft keys Dual-switched 10/100 mbps ports EHS support for Plantronics headsets Up to 1000 contacts Call history up to 200 records Order Now GXP1625 2 SIP accounts, 2 line keys, 3-way conferencing, 3 XML programmable context-sensitive soft keys Dual-switched 10/100 mbps ports, integrated PoE on GXP1625 HD audio on speakerphone and handset Order Now GXP1628 2 SIP accounts, 2 line keys, 3-way conferencing, 3 XML programmable context-sensitive soft keys HD audio on speakerphone and handset Dual-switched Gigabit ports, integrated PoE Order Now Mid Range IP Phones GXP2135 8 lines, 4 SIP accounts, 4 XML programmable context-sensitive soft keys Dual switched, auto-sensing Gigabit ports, built-in PoE 32 digitally programmable and customizable BLF/speed-dial keys Order Now GXP2170 12 lines, 6 SIP accounts, 5 soft keys and 5-way voice conferencing 48 on-screen digitally customizable BLF/speed-dial keys 4.3 inch (480x272) color-screen LCD Dual Gigabit ports, integrated PoE Integrated Bluetooth Order Now High IP Phones GXV3350 16 lines with up to 16 SIP accounts Built-in 1 mega-pixel CMOS tiltable camera for video calling with privacy wheel Runs on the Android 7.0 operating system Built-in Bluetooth for syncing with Order Now GXV3370 16 lines with up to 16 SIP accounts Built-in mega-pixel camera for video calling with privacy shutter Runs on Android 7.0 operating system Built-in Bluetooth for syncing with mobile devices and connecting Order Now