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Voice sounds fuzzy in voicemail recordings
When Automatic Gain Control (AGC) is used, adjustments to recording or playback audio can modify the incoming audio stream before it reaches the AGC operation. This causes extreme volume levels in the message, as heard in this fuzzy voice sample.
If the Cisco Unity version is 3.1(2) or later, and AGC is active, the WaveDBGainPlayback and WaveDBGainRecord values should always be set to 0.