Sorry I haven't visited here lately and didn't see this before. IMac, I sincerely hope you didn't in any way disable any of the communication routes to a central station before you reprogrammed your control panel (that's the BRAIN of the system, not the keypads/touchpads ) not to try to call out. If your panel is programmed to call out, and can't reach a central station, it will sooner or later find itself not communicating with the C/S and will inform you of that fact via trouble noises from the keypads at all hours. An FC (Fail to Comm) Trouble can only be reset with a power cycle: Power down completely, wait a minute for good measure, then power back up. That includes the system power transformer and system battery.
Your first step is finding and downloading the Installation and programming manual(s) and look them over, find the relevant programming addresses for programming communication options, and reprogram the panel NOT to call out. It's been years since I've worked with the Concord 4, so I don't remember off the top of my head exactly how that's done. I'm also travelling and it's almost 5 in the morning and I'm groggy and need sleep, so I'll check back in a day or so and see how you're doing---that's if you haven't already abandoned this thread.
A better bet might be to post your situation here
http://www.shieldlab.com/forum/index.php?action=forum where there are techs a lot more familiar with that particular panel.