How to use Google Voice to collect student's voice home work

Traditional Chinese 9 class has setup a  Google voice account to collect student's voice home work.  We have acquired a free phone number with a dedicate voicemail box.  Student can use home phone to leave home work as a massage.  In addition to that, teach can check the messages just like checking his/her emails.

Instruction:

I) Install a FREE Google Voice account.

1. sing up with a FREE google mail account.
2. log in to your gmail account.
3. In your browser, start a new window and type www.google.com/voice.
4. In the Google voice window, click "Upgrade My Account" button.
5. Select "I want a new number".
6. Enter Area or Zip code box with "408" then choose your prefered number. (Please copy down this number in a separate piece of paper.
7. Click on "Continue" button.
8. In "Create a new PIN" window, enter your pin number with 4 digit. (Copy down this PIN number for later use).
9. Check on " accept Google Voice's Terms and Privacy Policy." box and click "Continue" button.
10. Copy down the 2 digit secret code which will be used in your confirmation process.
11. Once your voice account is successfully installed, an email will be sent to you for verification (in your associated email account).  Please login, activate this mail, and enter the secret code found in step 10)

II) Setup the your voicemail box1) Repeat step 2 and step 3 in section I.
2) In Google voice window, select your phone number on the right top corner.
3) Select "Google Chat" but unselect all other resources (no home, cellular, or office).
4) Click on "Edit" button in Google Chat .
5) In the Settings window, Voicemail Access section, select "Yes", and "PIN not required".
6) In the Ring Schedule section, select "Never ring on weekdays" and "Never ring on weekends"

III) Call your Google Voice number and leave a message
1) use a regular phone (or cellular phone ) to call your Google Voice number.

IV) Check your voicemail box
1) login in to your Google account.
2) The voicemails are listed in your Inbox.
3) Open the mail and click "Play" button.

V) How to change your greeting message?
1) Search "google voice change greeting" on www.google.com.