Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
Take a handset and key in Menu#1606 Save Off
This will turn the volume on and set to the max volume.
If you have any other questions, just let me know. Otherwise, please take a moment to rate my service as this is the only way I am credited for my time. Hopefully I have earned 5 Stars but if not please let me know what I can do to ensure you are satisfied. I also invite you to contact me directly with any future support needs at http://bit.ly/1QwLxGh and ask for Nathan.
Thank you, ***** ***** a nice day,