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Re: VoIP and alarm systems

Alarm systems use fairly basic communication formats, such as DTMF or specialized frequency shift keying formats. The data transmitted to the receiving station is fairly limited-- the subscriber ID number, and the data that is being transmitted (zone numbers in alarm status, trouble codes, or daily communications test codes).

The alarm system MUST be wired properly to the phone line, connected directly to the telephone demarcation (or VoIP device), with all other telephone devices routed thru the alarm system. The alarm system MUST have the ability to sieze the telephone line, dropping any call that may be in progress, and dial the receive station. (Demarc -> alarm system -> all other telephones and inside wiring).

If the alarm system is connected like another telephone extension, it cannot sieze the line if someone is using a phone. If the VoIP installer disconnects the phone provider's line at the demarc, and plugs the VoIP device to an inside phone jack, the alarm system cannot sieze the line, as the phone line is now connected to the system's telephone output.

If you are having difficulties with alarm systems, make sure that the alarm system is connected to the phone line properly. If you are still having problems, see if the alarm provider can use another communication format, such as one that uses DTMF (touch tone) signals.
This is CABL.com posting #142823. Tiny Link: cabl.co/mLjL
Posted in reply to: Re: VoIP and alarm systems by bushmaster
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