How do I get a louder ring on my blackberry 8700

From profile on desktop choose Loud and activate - The megaoohone logo at the top of the homepage should now have a red outline.

I would suggest just getting a collection with a lot of loud tones.
You can get some from ExecTones
Here is the how-to on install loud Blackberry ringtones.
http://www.exectones.com/blog/60-seconds-to-install-ringtones-on-your-blackberry/24/

I just got the same blackberry, and have been fooling around with it to try and get it to ring.

Here's what you do:
1. Go to "Applications" and select "Media"
2. Select "Ring Tones"
3. Select "View"
4. Select "Preloaded Ring Tones"
5. Select "View". You will get a list of ring tones, organized alphabetically by 3 prefixes: "Alarm", "Notifier" and "Ringer".
6. Scroll down to the ones that start with "Ringer".
7. Select one. Select "Play". Hit the "Exit" button if you want to stop it, or let it finish and then hit "Exit".
8. Do this until you find one you like.
9. At the same menu that has "Play", scroll down to "Set as Ring Tone"
10. Click to select. Click again to confirm.
11. Exit-exit-exit until you're back at your main screen.
12. Call yourself from another phone to check it out. You'll find that the device will vibrate first for a bit, then ring with your new tone.

Enjoy! Hope this works for you - it did for me.

TJ