IP Paging & Network PA Systems

What "Audio over IP" actually means

In a traditional PA system, audio travels as an analogue signal from a microphone or source through a central amplifier, then out over 100-volt speaker lines to every speaker. In an IP paging system, the audio is converted to digital packets at the source and sent over the same network that carries your computers, printers and phones. Each endpoint decodes the packets and plays the audio locally.

The practical consequences are significant. Any endpoint can be addressed individually or in any group you define, announcements can originate from any authorised phone, console or software client, and the system grows building by building rather than amplifier by amplifier.

Power over Ethernet (PoE) endpoints

Most modern IP speakers and intercoms are powered by the network cable itself, using Power over Ethernet. This means one cable per endpoint carries both audio and power, which usually removes the need for an electrician to wire a 240V point at every speaker location.

The trade-off is that your network switches must supply enough PoE power for every connected endpoint. A modest school deployment can easily need a dedicated PoE switch, or switch upgrades, which is one of the main cost drivers in an IP project. Our network readiness checklist covers what to check before specifying an IP system.

Zoning, scheduling and per-endpoint control

• Zones are software-defined. A "zone" can be one classroom, one building, or the whole site, and can be changed without re-cabling.
• Calendars and schedules. Bell schedules, period changes and pre-recorded messages can follow timetables, including public holidays and term breaks.
• Per-endpoint volume and prioritisation. A hall can run quieter than a workshop, and emergency messages can preempt routine paging automatically.
• Remote management. Endpoint health, firmware and configuration are monitored from a web interface rather than a site visit.

For schools, these capabilities map directly onto bell and announcement requirements — see our school bells and announcements guide.

Emergency and lockdown capability

Because messages are digital, IP platforms can store pre-recorded emergency announcements, trigger them from multiple points, and target specific zones. Many platforms integrate with existing security systems or provide dedicated lockdown buttons. Planning guidance is in our emergency and lockdown communication guide.

Two-way communication and intercom

IP intercom endpoints add two-way audio, so classrooms or gates can talk back to the office. Many schools use a mix of one-way speakers and two-way intercom units. See the IP intercom guide for how two-way paging works and what it adds to a deployment.

IP vs traditional vs hybrid

A full IP system gives the most flexibility but assumes a capable network. A traditional 100V system is simple and cheap for basic paging but limited. A hybrid keeps working 100V speakers and cabling while replacing the control layer with IP — often the most cost-effective path for staged upgrades. The architecture comparison covers the trade-offs, and what to keep when replacing an old PA deals specifically with reuse.

What IP paging tends to cost

Endpoint count, indoor/outdoor mix, cabling state and network readiness are the main cost drivers. Indicative NZ installed ranges and a calculator for your own site are on the pricing page.

Choosing a platform

SPON, Algo, Axis, TOA, AtlasIED and Bosch all take the IP approach but differ in cost, ecosystem fit and complexity. Our platform comparison guide compares them on those dimensions for NZ buyers.

Next steps

• Check your network against the network readiness checklist
• Write your scope with the specification checklist
• Get an indicative cost with the ballpark calculator, or check potential school funding

Last reviewed 12 September 2026. General information only — not design or compliance advice for any specific site.