A limited use phone line would costs you about $15 a month (or even less). But this can easily be offset by the savings that you can make on your long distance bill.
Cellular communicators are also available, which can make your alarm call over any available cellular network. However, this option may very well make you shell more money rather than save since the device may cost about $200 to $500. Not to mention the additional fee of nearly $10 a month to your monitoring bill.
There are several alarm companies who offer radio signal transmitted monitoring services that do not depend on phone lines of any sort to transmit your alarm signal. However, the availability of such services is limited and depends on where you live.
Meanwhile, alarm companies are continuously working with manufactures and providers of VoIP services in order to find ways to properly integrate Alarm Systems with these phone communications industry changes. We could all hope that a lot of these changes will be observed in the not so distant future, since this is no passing fad. So it is important be on the lookout for updates on these changes, to ensure that you are always making an informed decision.