C - 2 MC75A Enterprise Digital Assistant User Guide
4. Tap the filename to enable VQM.
Audio Modes
The MC75A can be in any one of the seven different audio modes. The mode is visually indicated by the VQM icon 
on the title bar.
Figure C-1    
VQM Icon in Title Bar
The VQM icon indicates that the device is in speakerphone mode without Acoustic Echo Cancellation (indicated by 
the gray VQM icon). The audio modes and their corresponding VQM title bar icons are:
Changing Audio Modes
Depending upon the audio mode being used, the mode can be changed by tapping the VQM icon in the title bar. 
The audio mode can only be changed while the user is on a call. VQM icon can be used to switch audio modes for 
WAN calls.
Table C-1    
VQM Icons
Icon Description
Speakerphone with Acoustic Echo Cancellation.
Speakerphone without Acoustic Echo Cancellation.
Handset with Acoustic Echo Cancellation (device can be transitioned to handset 
mode only while on a VoWiFi or WAN call).
Headset while on a call (Acoustic Echo Cancellation is not enabled for wired or 
Bluetooth headsets).
 Headset while not on a call.
Bluetooth headset while on a call (Acoustic Echo Cancellation is not enabled for 
wired or Bluetooth headsets). White icon.
Bluetooth headset while not on a call. Gray icon.