Why your alarm fails to work using VoIP
A VoIP service provider has control over the network settings (namely the audio
codec) between your VoIP adapter and the number you are calling.
Understandably, the VoIP provider only cares about providing crystal clear
human voice for their customers. Unfortunately, they do not care about alarm
monitoring, and it just so happens that many of the technologies used in
providing clear human voice have a deteremental affect on alarm signal
transmission.
When the VoIP service provider is taken out of the equation, what you are left
with is a "raw" Internet connection. Using Linksys VoIP equipment at the
protected premises and a software based Virtual Receiver at the Monitoring
Center, in effect you have your own private network - a "controlled" path to
the Monitoring Center. Even though the data still travels over the public
internet, you have full control of the optimisation technologies and you can
adjust them to suit how an alarm panel and alarm receiver are designed to work - not a human
voice.
Another very important reason to remove the VoIP service provider from the
equation is that they become another link in the chain between your alarm panel
and the Monitoring Center. VoIP service providers are well known for taking
their servers down for routine maintenance and it is not uncommon for them to
be offline for days at a time. Many have only a single server, meaning there is
no redundancy in place for when things go wrong.
In summary, using "off the shelf" Linksys VoIP equipment that is provisioned for
alarm monitoring as opposed to human voice, it is reliable to send alarms over
the Internet.
Redundancy Options
For many, it is acceptable to use the popular low cost Linksys PAP2 or similar
device to provide an "IP Only" solution that relies 100% on the availability of
an Internet connection. It is essential to understand that alarms will not get
through to the Monitoring Center if the internet connection is lost or in the
event of power failure where all network equipment is not connected to a backup
power supply.
For those who are not prepared to rely totally upon their Internet connection,
one step up from this is the use of a Linksys SPA3102 VoIP ATA. It has an FXO
port that can be connected to a PSTN (POTS) line or to a
cellular alarm backup device
so that the alarm panel has an alternative transmission path in the event of
Internet or power failure. These devices can be provisioned in such a way that
when the alarm panel dials the primary number, alarms are sent over the
Internet. If that process fails, the panel will dial it's secondary number and
the alarm will be sent out of the FXO port and over the PSTN or cellular
network.
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