How to Turn Off Telephone Line Monitoring, DSC Power 632

how can I turn off the beeping notice that my phone line has been disconnected, on a "DSC Power 632" ? The alarm system is working fine except that when i turn it on, it eventually starts to beep at regular intervals to let me know that the telephone line has been disconnected. I do not have the option to reconnect the telephone line so I am very hopeful that you can find a way to program it such that there is no telephone monitoring service. Thank you Eddie