Grandstream X00395CFEN Grandstream GS-GXP2170 Phone

I have tested every IP phone I can get my hands on from a myriad of manufacturers. Cisco has great engineering, good voice quality, low latency, but they have no BLF keys (or very few to speak of). Fanvil has great BLF keys which allow for pages of keys which works perfect, but the phone has quality issues and cuts out. Yealink has some decent phones, but their flagships like the T48g have major latency on their audio. Note, this is not network related latency; every phone takes time to process the packets, and some do it MUCH faster than others (my testing has yielded about a 200ms gap in the speed of processing the voice packets from different phones and manufacturers). This Grandstream feels like a quality product, the screen is bright and brilliant, the pages of BLF keys is a perfect fit. Sometimes the screen doesn't move quite as fast as my hands do when I'm moving very fast, but it doesn't matter because the phone processes all key strokes faster than it displays on screen, meaning I am not limited in how fast I can move despite a 100ms delay on screen sometimes. This phone adds about 60-80ms in additional latency over my "fastest" phones I am saying are zero. I would like to NOT have that added latency which can add up when you top it with 250ms of latency from your SIP provider/internet, but the voice quality is outstanding and I know that is the likely cause of the delay. Much more and it would be outside what I'd accept; much less and I'd have a hard time measuring it (I can measure down to about 30ms). Great phone, about to buy a bunch more for our managers.