I know how useful it can be to have different notification sounds for different things, RAY41950. Here are some helpful steps. I'm sorry I was unable to find a link.
Go to the settings app.
Click Advanced, in the top right corner.
Scroll to and click on Voicemail.
On the next screen, click on "More settings".
Click Sound, then Select Ringtone.
Your device may ask for permissions to access the files, so you can select the tone you want.
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