Grandstream
From Indie IT Wiki
Introduction
Simple, intuitive, and effective. Our GXP1600 series of Basic IP phones deliver interactive communications to a desktop for the user who needs access to VoIP but does not require advanced features.
GXP1620
http://www.grandstream.com/products/ip-voice-telephony/basic-ip-phones/product/gxp1620/gxp1625
User Login to Reboot
username: user password: 123
Top Right > Reboot