Grandstream Networks GXV3370 User Manual page 84

When pressing Start an audio clip will start playing and you should be able to hear it
Once the audio is finished, you may select your reply based on your hearing experience, press:
Choose Noise: if you noticed a noise on the audio clip played, this will show a "Abnormal"
Choose No: if you were not able to hear any audio coming from the speaker, however, make sure that the volume is up.
This will also show as Abnormal status next to the Speaker Diagnostic.
Choose Yes: if the audio was heard without issue and this will show a "Normal" Status next to speaker Diagnostic
Once the Speaker Diagnostic is done with Normal status as a result, it will trigger the Microphone test automatically, and the
user can press Start button to begin performing the test:
Figure 131: Speaker Diagnostic
Figure 132: Ongoing Speaker Diagnostic
Figure 133: Abnormal status
Figure 134: Normal Status