Kramer,
This is the only method I know about to test the dial-out. You either have to trigger an alarm, or you have to set off a panic, but only if the system is armed FIRST will it dial out on a panic. If you press panic without arming the system first it will not dial out. I thought my dialer was not working because I tested it like described above. You can always unplug all external sounders from the wall and place a pillow or towel over the unit if you are concerned about disturbing neighbors etc.
,James