This is a great application for classes that have an oral presentation component in response to a verbal prompt (like Foreign Language or theater arts) or for students who need additional time or the ability to answer orally on a test.
The students can call in to the number from any phone and listen to a custom prompt then respond. Once the student responds, a voicemail is delivered to the teacher through an email (or other delivery option) which can then be graded with a rubric at the teacher's leisure. There is even the option to have the email transcribed. For this activity, several students can call in at the same time, and you can set your Google Voice so that it doesn't ring at all, but simply records the messages.
On the opposite spectrum, another feature allows you to direct your Google Voice number to ring in several places at the same time. So, if you have multiple classrooms or are out on the field or in the gym, you can set your Google Voice to ring on your cell phone, your office phone, your classroom phone, or the field house phone all at the same time. So, there isn't anymore guessing which phone to call based on the time of day. One number will ring on several different phones.
