VoIP Phone User Guides
Yealink T54W User Guide
See Image Below
How do you reset a Yealink IP Phone to factory default settings?
Method 1: Via web interface.Login in the web UI of the phoneGo to Settings → Upgrade page, select Reset to Factory SettingsPress OK to continue, press Cancel to quit.Method 2: Via phone menu.Press Menu Softkey.Go to Settings → Advanced UI,…
Grandstream GRP261x
GRP261x_user_guide.pdf (grandstream.com)
Grandstream DP7XX
http://www.grandstream.com/hubfs/Product_Documentation/DP750_DP720_User_Guide.pdf