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Devices & Software for audio distribution over IP networks


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Let’s suppose we have to deploy an audio over IP solution for a mall with these requirements:

  • Distribution of emergency messages to all mall zones.
  • Distribution of ambient music or prerecorded advertising messages to all the mall zones, including shop, hall, etc, with possibility to select different music  or messages in each zone.
  • In the shops (e.g. shop 2) a PTT microphone can be connected to the E417 for local messages.
  • The control of the devices can be made in a very comfortable way using a mobile device (i.e. a tablet or smartphone) with an application, for example to select the background music sources, volumes, etc...

This is the schema of the proposed solution:


More description of areas (control room, shop1, shop2, shop3, common areas)...


Control room:

In the control room, there is a PTT microphone connected to an E421 used for the emergency messages to be sent to all the building. The E421 is configured to send a multicast RTP audio stream when the ‘Talk’ button of the microphone is pushed. This RTP stream would be received by all the decoders in their EM layer channel and, as it has the maximum priority, will be decoded and played over any other audio they were playing.

Here we have also a computer running the management software with these characteristics[1] :

  • Generates several ICEcast streams, based on local files, for the BGM channels. 
  • Communicates with the App running in the guest’s smartphones to grant or deny permissions and to control the decoders in the rooms for the music selection.
  • Sends pre-recorded or live messages to specific zones using the AD channels.
  • Keeps control of the status of all the devices in the network.

Shops, common areas:

In each shop, there is an decoder connected to the loudspeaker(s) in the ceiling.

These decoders have the EM channel configured to decode the multicast RTP stream generated by the E421 encoder in the reception desk for emergency and evacuation messages or another information messages.

The 6 BGM channels are configured to decode the ICEcast streams served by the management software.

The selection of the channel to be decoded and the output volume is made through a mobile application that guests can download[2].

[1] Management application can be as complex as needed. We show here only a few possibilities for this example. EQUITEL provides by free all the information and support needed to create this applications and also can create them based on specific requirements.

[2] As with the management software, EQUITEL will provide support to create this kind of applications or can create them for a specific project. EQUITEL provides by free a basic application but, for most cases, it will be a better solution to create a specific one for each project.