Speaking of alarm systems over VoIP, here's a story of an alarm company that was sued by the estate of a murdered woman because her alarm system failed to notify the central station when the attacker broke in. It turns out she had switched to VoIP a few weeks earlier, which caused problems: http://www.security.honeywell.com/hsc/documents/alarmorg_VoIP.pdf Here's something from an alarm company: http://www.thealarmcompany.com/files/voip%281%29.pdf And from another alarm company: http://bentleyalarm.com/why-voip-is-bad-for-your-alarm-system/ Bottom line: I'd think really hard before switching an alarm system to VoIP. When we switched the company to VoIP, I was able to get a very inexpensive measured line for our alarm system. (We also use it for incoming FAX, because it works.) -- Steve