Document ID: 23847
Contents
Introduction
In some cases on Cisco Unity 3.1.2 servers, and possibly 3.1.3 upgraded servers, the Automatic Gain Control (AGC) registry settings are set to the incorrect values. These incorrect settings can cause loud white noise in the following situations:
- At the beginning of a message.
- Within the message when the user stops talking while recording the message.
- At the end of the message.
Problem
This problem occurs only if the registry setting values for AGC are set incorrectly. The bad values are usually:
- AGCsamplesize is 4e20 hex (20000 decimal) and should be 1f40 hex (8000 decimal).
- AGCgainthreshold is 28 hex (40 decimal) and should be 5 hex (5 decimal).
Solution
This problem can be eliminated by changing the registry settings to the correct values, as described in the AGC Registry Keys table that can be found in this Audio Quality document.Cisco Unity needs to be rebooted to get the registry changes to work.
Related Information
| Updated: Feb 02, 2006 | Document ID: 23847 |