C - 2 MC55A0/MC55N0 Enterprise Digital Assistant User Guide
Audio Modes
The MC55 can be in any one of the seven different audio modes. The mode is visually indicated by the VQM
icon on the status bar.
Figure C-1
VQM Icon in Status 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 Status 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 status
bar. The audio mode can only be changed only while the user is on a call.
The table below lists the current audio mode and the subsequent audio mode after tapping the VQM icon.
When using a Bluetooth headset with BTExplorer, enable the headset profile and ensure that the device is
connectable. Pressing the headset button pairs the headset back to the MC75A. A second click of the headset
button sends audio to the Bluetooth headset.
Table C-1
VQM Icons
Icon Description
Speakerphone with Acoustic Echo Cancellation.
Speakerphone without Acoustic Echo Cancellation.
Handset with Acoustic Echo Cancellation (device is in handset mode only while
on a call).
Bluetooth headset while on a call (Acoustic Echo Cancellation is not enabled for
Bluetooth headsets). White icon.
Bluetooth headset while not on a call. Gray icon.
VQM icon
Table C-2
Changing Audio Modes
Audio Mode before Tapping VQM Icon Audio Mode after Tapping VQM Icon
Speakerphone Handset
Handset Speakerphone
Bluetooth headset Speakerphone
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