Quick overview from the supplier:
Grandstream GXP2170, 6 SIP, 12 Lines, PoE, Black
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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
Supports up to four GXP2200EXT Modules for BLF/speed-dial access to up to 160 contacts
https://www.grandstream.com/products/ip-voice-telephony-gxp-series-ip-phones/gxp-series-high-end-ip-phones/product/gxp2170
