RTC & VOIP

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In the great technological migration, our old RTC and ISDN links will be supplanted by the digital Trunk SIP, H323, IAX links. But this migration is not new in the security sector, as Philippe CAMILLERI, Managing Director, underlines: «Many of our French or foreign clients have only TRUNK SIP links. Many Nordic countries, Switzerland, have undergone this change for years and the infrastructures that respond to these new imperatives are existing».

While security professionals are discovering the existence of VOIP, ESI has deployed many IPBXs in remote monitoring stations to receive and dispatch VOIP calls driven by M1 to several monitoring centers. Moreover, F1 decodes VOIP flows and ensures the conversion to your PBX ISDN through the XOIP for several years.

Two things will however change the current technical infrastructure towards a greater VOIP integration:

  • The disappearance of the local PSTN links forces us to replace the PSTN alarm panels by IP alarm panels , or connect the PSTN link to a converter to avoid such replacement . ESI therefore proposes the DUALCOM product.
  • The availability of new integrated IP native protocols in which image and sound are conveyed in VOIP, either with standard protocols such as SIP, or through proprietary protocols (SPC COM, SCAIP , others).

With VANDERBILT Company, ESI has just completed the development of the SPC protocol of the new transmitter/equipment of the global manufacturer. This integration realized with the help of our common client NEXECUR makes it possible today to have a fleet of panels permanently connected to the monitoring station and to receive the alarms and the audio in VOIP. Other manufacturers will soon be integrated by ESI.

The use of SIP protocol available on the RTC port of internet boxes could enable to transmit DTMF or alarm modulations. Latency and distorsion problems which often occur during the signal transmission should also be considered. In the past, the 48V supply used to protect against any power failure; would such failure happen nowadays, then the transmitter will be completely deprived of connexion via the internet box. No alarm can therefore be transmitted in case of a power failure, except if a powerful inverter is connected to the box.

ESI will therefore provide two answers:

  1. The DUALCOM solution is available as a supplement complement to your alarm center. The compatibility perimeter of the product will expand by integrating step by step new protocols and functionalities.
  2. In front of the planned disappearance of the native RTC/ISDN links, ESI is currently developing a new release of F1 integrating a SIP Trunck demodulator which will decode the RTC streams directly received on the SIP Trunk via fiber or DSL access.
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