Until now, only the traditional alarms systems could be used to send alerts to the Central Station. (Central Station is a common term used to refer to a company that provides services to monitor burglar, fire and residential alarm systems.) However, due to Ozeki VoIP SIP SDK, you can now communicate with the Central Station over VoIP by using your own C#.NET application.

It means that Ozeki VoIP SIP SDK allows you to receive Contact ID alerts coming from your alert system when there is an alarm in case of emergency. This way, we could say that 'you can be the Central Station'. You can be the other side as well: you can send out any alarm as if that would been sent by an alarm system. All this is possible with your C# application through your VoIP network.

1. How to receive a Contact ID alert in C#

   This article demonstrates the case when you receive alerts as a Central Station. Click here and take a look at the code example that shows how to receive Contact ID alerts by using your own C# program.
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2. How to send a Contact ID alert in C#

   Here you can learn more about sending Contact ID alerts through VoIP from code in C# programming language. If you want to send alerts, check this code snippet that is the best place to start.
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3. Frequency tone generation in C#

   Concerning to the fact that the alarm signal is a DTMF signal, there is a need for generating and detecting such signals. This guide explains the first one, that is describes how to generate frequency tone in C#.
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4. Frequency tone detection in C#

   The Contact ID consists of DTMF signals that will be sent and received during an alarm. To be able to send/receive alerts it is required to generate and detect the necessary frequencies. This page presents their detection in C#.
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