From your phone, call one of the following numbers depending on your city.

Roseburg 541-492-4713
Eugene 541-762-4713
Medford 541-494-4713
Bend 541-585-4713
Portland 971-634-4713

When prompted for a pass code, enter 1234 # (if checking your Voice Mails remotely you will be prompted first for your phone number).

You will now be at the main menu. Listen to the menu choices carefully.
For security reasons it is important that you press 8 to change your pass code. You may change your pass code and/ or greetings as often as you would like, by once again following the instructions.
Press 1 to access your Voice Mail box.
You can now setup your Busy (press 2) and/or No-answer greetings (press 3).
Press 2 to setup your personalized Busy greeting, then press 1 to record a new Busy greeting. When satisfied with your new greeting, press the * key to return to the main menu.
Press 3 to setup your personalized No-answer greeting, then press 1 to record a new No-answer greeting. When satisfied with your new greeting, press the * key to return to the main menu.