There has a lot of discussion in the past regarding problems with alarm monitoring and VOIP.
I have had my panel monitored by NextAlarm for a few years and am happy with their service. Right now I have Vonage and keep a regular POTS for backup. My alarm panel is still connected to the POTS.
Just noticed that AlarmPath now supports VoIP alarm monitoring. Esstentially, they will ship you another SIPURA that's sole purpose would be to connect to the panel. This would be in parallel to whatever ATA you have for voice. Decent price, $8.95 per month for monitoring.
This may be an interesting option for those that want to using their broadband for panel monitoring.
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www.nextalarm.comWhat's more interesting is that they are probably using the Asterisk PBX to receive the panel info. Asterisk does have an application to receive ContactID info. Notice the IAXy in their product page.