How to fine tune your VoIP equipment and network to increase reliability

The goal of our VoIP Solutions are to allow the use of any make or model of VoIP equipment regardless of the equipment or network settings, however, we offer some guidelines that may improve the ability of our platform to recognize the DTMF tones sent out by your alarm panel. If you send some signals to our test numbers and they are received OK, then that may be sufficient for your requirements, however, if you are technically inclined and want to investigate ways to improve reliability and redundancy, then read on.


In Band or Out of Band DTMF Tones?

The Contact ID alarm format comprises of a number of DTMF tones which are generated by your alarm panel. Your VoIP equipment detects these tones and has to decide how to transmit them over the Internet to the VoIP service provider, who in turn has to decide how to forward them on to the far end, which in our case is a VoIP Alarm Receiver. There are three methods to choose from:


DTMF Setting How tones are sent to our server
In Band Tones are embedded into the RTP packets of the audio stream
Out of Band - RFC2833 Tones are sent separately as special telephone events
Out of Band - INFO Each tone is sent within its own SIP INFO packet


Where do you adjust the DTMF settings?

Generally, there is a setting inside your VoIP equipment which you may or may not have access to. If you cannot change it directly within your equipment, most VoIP service providers allow you to adjust the setting within their web platform. You may need to experiment with your VoIP equipment and network settings and also try different test phone numbers in order to get the best performance. Use our web site menu to navigate your way to technical instructions for popular makes of VoIP equipment like Cisco, Obihai and Grandstream.


Which DTMF setting is the most reliable for alarm systems?

The IP Alarms Virtual Receivers support all three DTMF transmission methods and although the two Out of Band methods are more reliable, they might be technically more difficult to setup within the VoIP equipment. This may involve using a spare second line on the VoIP equipment or changing the Dial Plan to map the telephone number dialed by the alarm panel to a SIP URI. If you chose Out of Band DTMF, then you need to make sure that you are connecting to the correct receiver in our platform, so please seek technical support if you are unsure.