The phone includes 8 BLF/speed dial keys that allow users to easily monitor presence and status of other extensions and transfer calls. As all Grand stream IP phones do, the GXP1628 features state-of-the-art security encryption technology (SRTP and TLS).
I won't re-write Grandstream's description for this phone. I found the phone setup straightforward. Entering information from the keyboard was almost as easy as using the desktop app. I think the sound quality is very good. DHCP works well. I use the phone on a private network without a server. I don't need many features. I found setting that up was somewhat mystifying and reading the information on the Grandstream website not all that helpful. Bottom line: nice phone and glad I bought it.