Cisco Cisco IOS Software Release 12.4(2)XB6

Check the level (DSP/LE) statitstic for sufficient echo amplitude. If the amplitude of the echo is low, 
it can go unnoticed.

For additional echo troubleshooting information, see the 

section in the 

.

Use the level (DSP/LE) statistics to check voice levels. As much as possible, try to achieve a uniform 
input decibel level to the packet voice network. Doing so eliminates or at least reduces any voice 
distortion because of incorrect input and output decibel levels. Adjustments to levels might be required 
by the type of equipment connected to the network or by local country-specific conditions.

For additional voice level troubleshooting information, see the 

section in the 

.

DSP voice quality metrics are described in the following sections:

DSP voice quality metrics vary by DSP technology. Use 

 to determine which DSP metrics your 

platform supports.