Integrating Overhead Paging Devices with InformaCast

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Getting the Message to Everyone

One of the first uses for InformaCast, and still one of the most popular, is overhead paging. Whether it’s live audio or a prerecorded message, leveraging an audio system with IP speakers helps get the word out quickly. Every organization is different, so the configuration for integrating overhead paging devices with InformaCast will vary depending on the design.

Learn why overhead paging is critical for emergency notification

This blog post will walk through different overhead paging integration design options for IP speakers, zone controllers, and the InformaCast Legacy Paging Interface.

Connecting to IP Speakers

InformaCast compatible IP speakers are readily available from several vendors. IP speakers offer an efficient and flexible method for overhead paging integration. With InformaCast, IP speakers are automatically registered. Each speaker is considered an individual recipient that can be divided into zones based on where each is located in a building or campus. This can be done per-speaker or dynamically created using filters for IP addresses or subnets.

IP speakers also put a minimal load on an organization’s network. Since IP speakers use the same multicast audio stream received by IP phones and InformaCast Desktop Notifier (IDN), a single 80 kbps, G.711-ulaw audio stream is all that is needed to send a message, regardless of how many speakers receive a broadcast.

Using a Zone Controller


If an organization already has analog speakers, it may not want to spend the time and money to upgrade to IP speakers. If that is the case, there are still options for connecting InformaCast with overhead paging. By using an InformaCast-compatible zone controller, organizations can connect analog speakers to their network. The zone controller registers with InformaCast and has an audio line-out that connects to existing paging amplifiers and analog speakers. Organizations using this method still benefit from using the same multicast audio stream as IP phones, IP speakers, and IDN.

The InformaCast Legacy Paging Interface


An organization with an analog paging system that is already set up to dial from a PBX or phone system. If that is the case, the integration work is already done, and there is likely a voice gateway with an FXS or FXO analog trunk integrated to a paging adapter and a paging amplifier. InformaCast can also accommodate this kind of configuration with its Legacy Paging Interface (LPI) feature.

InformaCast places a SIP call via LPI to a phone system and calls the same extension your phones dial to broadcast an overhead page.

If an existing paging adapter has multiple zones selected via DTMF tones (e.g., press 1 for zone 1, 2 for zone 2, etc.), the Legacy Paging Interface can send the necessary digits.

If users currently dial an extension to deliver an overhead page, that extension may benefit from being redirected to InformaCast using DialCast to trigger an overhead page. Users could also assign a new extension to the analog paging adapter. In this way, an organization could use InformaCast to send audio to the existing analog speakers and any of InformaCast’s other outputs like IP phones, email, digital signage, and more.

It’s important to note each SIP call that the Legacy Paging Interface makes sends a unicast RTP audio stream. This means it does not scale as well as IP speakers or zone controllers. InformaCast can send a broadcast to 100s or 1000s of IP speakers or zone controllers because it only needs to send one audio stream onto the network, but the Legacy Paging Interface cannot reach that same scale as each device needs its own unicast audio stream.

For more information, including links to more detailed configuration help, visit the Singlewire Support Community.