Well it pretty much is that easy, you just place your call back number with or without the 9 access code (depends on the Vmail system your on, the system may input the "9" access code for you or it may not)and enable it. Be sure to set the schedule and how often it dials you for notification and how many attempts it takes until failure. Then check out your ports page, and verify that some of your voice ports are set as dial out ports and you should be good to go for a test.