Appendix C Voice Quality Manager
Introduction
The Voice Quality Manager (VQM) is a software package that resides on the MC75A. VQM enables a set of
features for Voice over WiFi (VoWiFi) calls, and a sub-set of those features for cellular line (GSM or CDMA) calls.
The VQM user interface is designed to be intuitive and easy to use, so complex tasks such as enabling the
Acoustic Echo Canceller (AEC) while a call is in progress, automatically switching audio modality for VoWiFi calls,
setting appropriate audio gains for VoWiFi, are done with very little or no user intervention.
Features
The VQM software:
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Improves the voice transmission quality without using additional battery power.
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Turns on the AEC for VoWiFi calls automatically, without user intervention.
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Automatically sets correct audio gains for VoWifi calls, via specific profiles for VoWiFi and WAN calls.
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Capability to automatically switch audio mode to handset from speakerphone mode, after initiating a call or
after accepting a call.
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Prioritizes the outgoing audio IP packets.
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Provides user-selectable audio modes (speakerphone and handset) with a single tap of the VQM icon. A
VQM icon in the title bar of the device indicates the audio mode currently in use.
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NDIS 5.1 compliant.
Enabling VQM
To enable VQM:
1. Tap Start > Programs > File Explorer.
2. Navigate to the Windows folder.
3. Locate the file VQMAudioNotify.
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