Test the Hardware

If your phone is having any issues, your system administrator may ask you to access a diagnostics menu on the phone to test its hardware.

You can test the display, microphones, and speaker. Contact your system administrator for instructions on how to perform these tests.

CAUTION: Do not run diagnostic tests during a call on VVX 450 business IP phones with two connected expansion modules. Doing so can cause the phone to reboot.


  1. Navigate to Settings > Status > Diagnostics.
  2. Select Test Hardware and select one of the following:
    • Audio Diagnostics
    • Display Diagnostics
    • Brightness Diagnostics
    • LED Diagnostics
    • Keypad Diagnostics