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Joe We do what we do and hope the advice we are given is best. We are a small alarm co and punch well above our weight. Of course we think we have taken best advice on security but we may never know

J, Very interesting, and covers a lot more than your direct interest. Im assuming you think the final mile (ie the arc) is an easier attack point if its known than the individual site/system. To minimise the exposed footprint from send point to recieve point what would you suggest? Private circuits or VPN's. From the transmission point of view its easier to attack the fixed line (pstn) side than anything else but also the gsm side can be vulnerable. Id of thought that any high grade system based on regular polling would be immune to the reporting (not the attack) but if using an ATS 5 device if the device was attacked this would be shown in less than 3 minutes. However if the end that handles that reporting is attacked what would happen then? I assume a DOS style attack on an ARC would be more effective if it swamped it with false signals. The more i think about it the more it seems the arc is the most effective attack point? James