In the Agent's PC, go to:
C:\Documents and Settings\<username>\Local Settings\Application Data\Avaya\Agent desktop\Sounds\Incoming.wav
- Copy the incoming.wav file.
- Start, Run, "C:\WINDOWS\system32\sndrec32.exe", <enter>.
- In sndrec32.exe, File > Open > [your original WAV file].
- Play button to check volume level.
- Then Effects > Decrease Volume. Personally, I would do that Decrease Volume step something like three times in succession.
Play button to check new volume level.
- File > Save
- Replace the old sound file with the modified Incoming.wav
Additionaly, if using win10, sndrec32 is not avalible any more, however another program like Audacity (http://audacityteam.org/) can be used to modify the amplitude of the wav file to a lower volume.