Grandstream Networks DP750 Administration Manual page 36

Configure/View SIP accounts settings.
8. System Settings
Change Base PIN code, perform factory reset, reboot base and configure
repeater mode.
9. Firmware Upgrade
Upgrade the firmware version of the Handsets.
10. Factory Functions

Keypad Diagnostic
All LEDs will light up, and the LCD will display a table listing the names of all
keys in red. Press any key to diagnose; the key's name will display in blue. After
all keys are diagnosed, a prompt message ("PASS") will display; press "Back"
(right softkey) to exit.
Note: User can long press arrow UP key to exit at any time.

Audio Loopback
Speak to the phone using speaker/Handsets/headset. If you can hear your
voice, your audio is working fine. Press "Exit" softkey to exit audio loopback
mode.

LCD ON / OFF
Select this option to turn off LCD. Press any button to turn on LCD.

LCD Diagnostic
Select this option to enter LCD Diagnostic mode. Press "Next" (left softkey) to
display white screen. Continue pressing the left softkey to view all remaining
screens (black, blue, red, and green) and then exit. End the test early by
pressing the right softkey.

LED Diagnostic
Enters this option and press "1" to start LED Diagnostic (you will notice that the
color of the LED will be changing). Press "2" to quit.

System Monitoring
Displays RSSI, battery voltage and RPN information.
DP750/DP720 Administration Guide
Version 1.0.11.4
P a g e | 36