You can't adjust the playback volume seperately for prompts, greetings, voice names or messages... you can adjust the volume output for all recorded files by adjusting the median volume registry setting:
In the Registry, go to HKLM>Software>ActiveVoice>Miu>1.0>Initialization>ServiceProvider1>MedianVolume.
By default it's 50... 100 is twice as loud, 25 is half as loud etc... (i.e. it's not in decibles, of course!). You will have to restart your server to test the playback level to see if it helps. Again, this adjusts the over all volume for all outbound palyback except TTS messages (you'll see TTS playback volume adjustment settings in the same registry branch above).
Dialogic adjusts the volume for recorded messages on the inbound side using AGC. It'll work to make all messages reach a particular dB level regardless of it they're too quiet or too loud. I'm not sure off hand how to adjust this target dB level to something different, but I'm certain it can be done. Someone from the MIU group will need to help out here...
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