DS7000 no longer calls out

[akamatsu]

It used to work just fine, and would dial my cel phone. I accidentally tripped the alarm, and noticed that it did not call me. I tested it repeatedly, to no avail. I also re-programmed my cel number into all four slots. Still nothing. A landline phone works when plugged into the jack that I'm using for the alarm. I can't figure it out. Please help.