Scenarios · education

School Intercom Systems — staff phones, campus paging and one-touch emergency calls

A school needs two systems that behave like one: a telephone system for staff, and a broadcast and call system that reaches everyone else — classrooms, corridors, the canteen, the playground and the gates. In the design documented here both register to the same IP PBX, so an announcement, a bell and an emergency call all come from one dial plan and one console. The counts scale with buildings and zones rather than with classrooms. NEXVIA designs, manufactures, supplies and commissions the system; the terminals and speakers are manufactured by NEXVIA.

Staff desk phones for offices, reception and faculty rooms — from two-line entry sets to six-line phones with Gigabit PoE
Wall-mount handsets (V60G, V50G) for corridors, labs and staff rooms where a desk phone has nowhere to sit
Speaker coverage over the network: A201 ceiling, A212 wall, and the IP66 A233 horn for playgrounds and sports fields
One-touch emergency call points (A10W panel, A12V outdoor station) on the same PBX as the staff phones
Scheduled and live announcements with custom time templates, plus offline timed broadcast on the speakers
Up to 20 multicast zones with prioritisation and group pickup across up to 32 departments

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Campus walkway between teaching buildings, the area SIP paging covers

The short answer

A single school building is typically 20 to 40 staff desk phones, 4 to 8 corridor handsets, 1 paging console, 8 to 20 speakers and 2 to 4 emergency call points — one PBX carries all of it, with 62 SIP trunks on the OM50G. A campus of several buildings repeats those counts per building and moves to the OM200G with 496 trunks or the OM1000-UC with 1000.

The broadcast side is what distinguishes a school from an office: up to 20 multicast zones with prioritisation, scheduled broadcasting using custom time templates, and real-time text-to-speech for messages that are typed rather than recorded. The A201 and A212 speakers also keep an offline timed broadcast running on their own, which is how a bell timetable survives a network interruption.

Emergency calls are counted separately and deliberately: a call point at each gate, each outdoor walkway and each help point — the A10W fits a standard 86 box with one alarm input for an external emergency button and one relay, and the A12V is an IP66 and IK10 outdoor station from −40 °C to 70 °C with an anti-tamper alarm. Prices are not published on this site; NEXVIA quotes per building, per zone and per call-point count.

Paging architecture: the deployment tiers, and how zones and endpoints attach to them

What goes wrong on this type of site

Staff move; the phone does not

Teachers share offices and staff rooms. Ring groups, group pickup across up to 32 departments, and a phone at each shared position keep a number reachable when the person is not at their own desk.

Announcements must be heard in the right places

A campus broadcasts to specific areas: classrooms and corridors separately from the playground and the canteen. Zone management on the console and up to 20 multicast zones with prioritisation across the speaker family are what separate a broadcast from noise.

The emergency call point has to be reachable

Calls for help come from a corridor, a lab, a walkway or a gate. The A10W panel fits a standard 86 box, the A12V is an IP66 and IK10 outdoor station, and both register over SIP and can link to a camera over ONVIF.

The school day is scheduled to the minute

Announcements follow a timetable. Scheduled broadcasting uses custom time templates, the A201 and A212 speakers support offline timed broadcast, and the advanced paging tier adds real-time text-to-speech for messages that are typed rather than recorded.

Choosing by size

Size band	System	Devices	Notes
Single school building	OM50G — 62 SIP trunks; up to 12 analog ports for a legacy line or a fax	20–40 staff desk phones, 4–8 corridor handsets (V60G), 1 console (X210i), 8–20 speakers, 2–4 emergency call points	Ring groups hold up to 40 extensions on this model. Capacity is published in SIP trunks, because a maximum extension count is not stated, and the office can keep its existing analog line on an FXO port.
One campus, several buildings	OM200G — 496 SIP trunks; up to 96 analog ports on 24-line interface cards	Desk phones per building, wall handsets in corridors and labs, speakers zoned per area, emergency call points at gates and walkways	4 hot-swap slots and gigabit Ethernet as the paging backbone. Where a building still terminates pairs on a frame, up to 96 analog ports can be fitted, and PT2400 or PT4800 patch panels suit the equipment room.
Multi-campus or district deployment	OM1000-UC — 1000 SIP trunks, up to 200 concurrent calls per trunk	The same counts repeated per campus, with one console per site and a shared dial plan across the estate	SIP only, with dual hot standby (3 fixed IP addresses) and multi-site networking using unique or repeatable numbering — the model for an authority that runs its own numbering across sites.
Retrofit of an older building	OM50G — 62 SIP trunks	Wall handsets and call points where cabling exists, PN1 2-wire converters where it does not, PA3 or PA2S gateways to the existing speaker line	PN1 carries network and power over an existing two-core cable; the IP endpoint tier is stated to bridge legacy paging systems into the IP environment, so an existing analog speaker line can be reused zone by zone.
Sports field, playground or separate sports block	OM200G or OM50G — 496 or 62 SIP trunks	Outdoor horn speakers (A233), outdoor call points (A12V), one console at the site office, portable handsets for staff on duty	A233 is an IP66 horn with 30 W rated output for outdoor coverage; two-way broadcast is not supported by the series, so talkback positions need a model that publishes it, such as the A212.

Numbers behind the design

School communications equipment, as published
Model	Where it goes	Published capability	Power and mounting
A201	Classrooms, halls, indoor ceiling coverage	Ceiling SIP speaker with built-in microphone, system self-test, monitoring, two-way voice, offline timed broadcast, up to 20 multicast zones	PoE, PoE+ or DC; the rated output is printed two ways in the source, so the wattage is confirmed on the quotation
A212	Corridors, canteen, gym walls	8 Ω, up to 15 W class D output; talkback with an omnidirectional microphone; alarm linkage; offline timed broadcast; up to 20 multicast zones with prioritisation	10/100 Mbps Ethernet with integrated PoE (published as PoE 8 W / PoE+ 15 W); wall mount with optional angle bracket
A233	Playground, sports field, outdoor circulation	Horn speaker with 30 W rated output, built-in microphone for self-test, monitoring, environmental noise detection and two-way voice	IP66; PoE, PoE+ or DC
FH-S01	Ward-style ceiling audio indoors (assembly hall option)	Up to 20 W with a built-in class D amplifier, talkback, customisable WAV for emergency notification, up to 20 multicast zones	PoE to IEEE 802.3af; ceiling mount
A10W	Corridor help point, classroom door, stair lobby	Three function keys, 2W speaker with echo cancellation, one relay, one short-circuit input for an external emergency button; one-click call rings the host plus the call-group extensions	Standard 86 box; PoE or 12 V DC; IP54; −10 °C to 50 °C
A12V	Gate, walkway, outdoor help point	4 MP camera with IR night vision, 10W speaker with AEC, 2 short-circuit inputs and 2 outputs; anti-tamper alarm to the control centre	IP66 and IK10, −40 °C to 70 °C; wall or flush mounted; ONVIF and RTSP on the video model
i16S / i16SV	Sheltered outdoor or semi-exposed positions	i16SV: HD camera with IR night vision, 1080p, 3W speaker with AEC, 2 inputs and 2 outputs, 2 relays	IP65 and IK10, −30 °C to 60 °C; anti-tamper alarm
X210i	Main office paging console	106 DSS keys across three screens, gooseneck microphone, group broadcasting, 20 SIP lines	Dual Gigabit with integrated PoE; Bluetooth 4.2
A330i	Site office or control room console	116 DSS keys, 10.1-inch touchscreen, 92 dB speaker, 8 short-circuit inputs, 1 output and 1 RS-485 interface, built-in broadcast system	Dual Gigabit with PoE; Android 14
X6U	Reception and main office	Three screens, 20 SIP lines and five LED line keys, 60 DSS keys	Dual Gigabit with integrated PoE
V61G / V60G	Faculty room, library desk, corridor handset	V61G: 2.4-inch 320×240 screen, four lines, dual Gigabit with PoE. V60G: wall-mount handset with 6 keys and dual Gigabit ports	PoE support; V60G is wall-mount only
W611W	Duty staff and site supervisors on the move	IP67 Wi-Fi 6 handset, 16 DSS keys and a push-to-talk key, 1900 mAh, up to 9 h talk / 200 h standby	Wi-Fi 6 dual-band 2.4G and 5G; Bluetooth 5.0

This design against a conventional analog school PA and telephone system
Requirement	Conventional analog PA and phone system	This IP design	What changes operationally
Bell and announcement timetable	A bell timer unit wired to the amplifier, or a manual clock	Scheduled broadcasting with custom time templates, plus offline timed broadcast held on the A201 and A212 speakers	The timetable is a configuration, and the speakers keep it if the network drops
Zone control	Mechanical zone selector switches on the amplifier	Up to 20 multicast zones with prioritisation, addressed from a console or an IP phone	A single classroom, a floor or the whole campus can be addressed without rewiring
Emergency call point	A dedicated alarm button wired back to the office	A10W in a standard 86 box with one alarm input for an external emergency button, ringing the host plus a call group; A12V at gates and walkways with an anti-tamper alarm	A call point is an extension, so it works from places a cable could not previously reach
Staff telephony	A separate phone system, separately maintained	The same PBX carries staff extensions on 24 to 1000 SIP trunks, with voicemail, ring groups and call detail records	One system to manage and one dial plan to learn
Reaching classrooms	A speaker in every room on the same zone	A speaker per zone, plus a wall handset (V60G) or a wall-mountable desk phone (V61G) where a room needs a telephone	Classrooms get what they need rather than a blanket fit
Legacy cabling	Replace the amplifier and the speaker line together	PA3 and PA2S gateways drive the existing passive speakers and legacy analog horn speakers; the IP endpoint tier is stated to bridge legacy paging into the IP environment	The job can be done zone by zone within the budget
Records	None	Audio archiving of SIP paging, intercom and calls where the paging tier provides it; call detail records to a server on port 1809	Announcements and calls can be reviewed after an incident

Deployment by area

Area	Device	Note
Main office, reception and paging position	X6U (reception) + X210i console (paging)	X6U: three screens, 20 lines and five LED line keys for the busiest answering position. X210i: 106 DSS keys across three screens with a gooseneck microphone, group broadcasting, 20 SIP lines and dual Gigabit ports with integrated PoE.
Staff room, faculty office, library desk	V61G	2.4-inch 320×240 colour screen, four lines, dual Gigabit with PoE. The range places this model at a classroom or library desk as a wall-mountable build with no wireless radios to manage.
Corridor or lab handset	V60G	Wall-mount handset with a 2.4-inch colour screen, six keys and dual Gigabit ports, for calling the office from where staff and students pass.
Classrooms, corridors, canteen — announcements	A201 ceiling speaker / A212 wall speaker	Both support up to 20 multicast zones with prioritisation and offline timed broadcast. A212 adds talkback and an external volume knob; the A201 rated output is confirmed on the quotation because the source prints it two ways.
Playground, sports field, outdoor circulation	A233 horn speaker	Horn speaker with 30 W rated output and IP66 protection, with a built-in microphone for self-test, monitoring and two-way voice.
Classroom doors, stair lobbies and corridors	A10W SIP mini intercom	Standard 86 box, three function keys, 2W speaker with echo cancellation, one relay and one alarm input for an external emergency button; one-click call rings the host plus the call group.
Gates, walkways and outdoor help points	A12V outdoor station	IP66 and IK10 from −40 °C to 70 °C with a 4 MP camera and an anti-tamper alarm to the control centre; i16S/i16SV covers sheltered positions at IP65 and −30 °C to 60 °C.

Questions buyers ask

How many speakers does a school need?

Count zones, then speakers per zone. A single building usually lands at 8 to 20 speakers: one or two per corridor length, one per hall, one per canteen, and a horn for the playground or sports field.

A201 covers a ceiling area; A212 is the wall-mounted option with talkback; A233 is the IP66 horn with 30 W rated output for outdoor areas.
Up to 20 multicast zones with prioritisation is the design ceiling for the speaker family, so a school with more than 20 areas groups them into zones rather than adding separate systems.
Each zone should be a separate speaker run so it can be addressed and volume-adjusted independently from the console.

Can the school keep its existing PA speakers and cabling?

Yes. The IP endpoint tier is stated to bridge legacy paging systems into the IP environment, and the PA3 and PA2S gateways drive passive speakers and legacy analog horn speakers — so the choice is full IP or hybrid, not rip and replace.

Both gateways publish a 10–30 W mono output that adapts to the input voltage, with a line out for an external active speaker or amplifier.
PA2S is powered to IEEE 802.3af with 12–24 V 2 A DC as an alternative; PA3 is PoE/PoE+ (IEEE 802.3at, published as PoE Class 4) with the same DC alternative.
Convert the busiest zones first and keep the old line running where the cable is still sound.

How are emergency calls raised and answered?

One-touch call points ring the host and the call group: the A10W has an alarm input for an external emergency button, and its one-click call rings the host plus the group extensions. The A12V outdoors reports an anti-tamper alarm to the control centre, as do the A11 and i16 series.

One-key alarm activation, alarm light flashing and simultaneous calling to the management unit are stated for the IP endpoint tier.
The answering position can be a console phone such as the X210i, A330i or A320i on the same PBX — the A330i takes 8 short-circuit inputs, 1 output and an RS-485 interface for alarm and control inputs.
Terminals support ONVIF, so a call can be linked to a camera and reviewed on a VMS where the site runs surveillance.

Can announcements be scheduled automatically?

Yes. Scheduled broadcasting uses custom time templates, real-time text-to-speech covers typed messages, and the A201 and A212 speakers keep an offline timed broadcast running on their own — which is what a bell timetable needs when the network or the office is unattended.

Live announcements can be made to individuals or groups from the console or from a mobile app with alerts, where the advanced tier is used.
Time-of-day routing supports up to 3 periods per day and the route table holds 500 entries, which is how different buildings can dial out over different trunks.
A bell, a period-end tone and a PA announcement are all the same output on a SIP speaker; the schedule decides which file plays.

Do we need a phone in every classroom?

Not necessarily. The range includes wall-mount handsets for corridors, labs and staff rooms, and SIP intercom panels for call points. A classroom that does need a phone can take a wall-mountable desk phone such as the V61G, which publishes a 2.4-inch screen, four lines and dual Gigabit ports with PoE.

Corridors, labs and staff rooms: V60G wall handset with six keys and dual Gigabit ports.
Classroom where a phone is required: V61G wall-mountable with PoE.
Shared teaching spaces: an A10W panel at the door, so a call can be made without entering the room.

How do staff who are not at a desk get a call?

With a portable handset on the same extensions. The W611W is an IP67 Wi-Fi 6 handset with 16 DSS keys and a push-to-talk key, 1900 mAh and up to 9 hours of talk time; the W620W adds a 3000 mAh battery (up to 13 h / 240 h) and H.264 video preview.

Group pickup covers up to 32 departments, so a call to a faculty office can be answered from the next room.
A DECT multi-cell option (W710H base with W610D handsets) is available where coverage must not depend on the Wi-Fi network — up to 30 handsets per base and 300 per system.
Portable handsets also receive broadcast and one-key alarm notifications in the published endpoint tier.

Can the system link to the school cameras?

Yes. Terminals support ONVIF and connect to third-party VMS platforms, camera events such as intrusion or loitering can trigger pre-recorded broadcasts, and the A513W puts a speaker and a 4 MP IR camera in one IP66 enclosure for positions that need both.

A call from a call point can be linked to the nearest camera and reviewed together.
Pre-recorded alerts triggered by AI camera events are stated for the endpoint tier.
Keep the VMS and the intercom on the same network segment where the site wants tight coupling, and record who owns the integration.

Cabling, power and network notes

Speakers and panels are PoE, so an announcement point needs one cable; the A233 horn and the A513W video speaker carry IP66 for outdoor mounting.
Outdoor positions must match the site: A12V is IP66 and IK10 from −40 °C to 70 °C, and the i16S/i16SV intercoms are IP65 from −30 °C to 60 °C.
Time-of-day routing supports up to 3 periods per day and the route table holds 500 entries, which is how different buildings can dial out over different trunks.
Where a building has no data cabling but has two-core cable, PN1 extends PoE wiring over the existing pair and reaches up to 1600 m for the network function without power.
Zoned broadcast is planned per area: the speaker family supports up to 20 multicast zones with prioritisation, and consoles discover and auto-provision the terminals they manage.
The legacy speaker line is bridged, not abandoned: PA3 or PA2S drives the existing passive speakers, and each converted zone becomes a multicast zone on the new system.
Plan the PoE switch per zone rather than per building — a hall with several speakers and a console can consume more power than a whole corridor of panels.

Staff telephony

Extensions register from 200 upwards, with the auto attendant and multi-level IVR answering outside calls before the office does.
Ring groups in sequential, rotating or simultaneous mode and group pickup across up to 32 departments keep a call moving between staff rooms.
Voicemail is retrieved by dialling *98, with the option to forward messages to a mailbox.
Five outbound permission levels and call barring by day and time restrict where a phone can call — useful for phones in shared spaces.
Do-not-disturb, call transfer in six variants, hold, park and three-way calling are available on the system.
Call detail records can be pushed to an external server on port 1809 if the site bills or audits calls.

Campus broadcast and safety

Zoned paging and scheduled announcements with custom time templates, from one console or from an IP phone.
Real-time text-to-speech, so an announcement can be typed rather than recorded.
Up to 20 multicast zones with prioritisation across the speaker family, and offline timed broadcast on the A201 and A212.
Analog paging cabling can be bridged into the IP system with PA3 or PA2S gateways instead of being replaced, so an existing speaker line can be reused.
One-key alarm activation, alarm light flashing and simultaneous calling to the management unit are stated for the IP endpoint tier.

A zone plan for a school, area by area

Typical zone and device plan by area

Area	Speaker or device	Zone behaviour	Why this device
Classroom block corridors	A201 ceiling or A212 wall	One zone per corridor or per floor	Even indoor coverage; offline timed broadcast keeps the bell running
Assembly hall	A201 or FH-S01 ceiling	Own zone with priority over corridors	Higher output and talkback coverage for a large room
Canteen	A212 wall	Own zone	Talkback and a volume knob that staff can use locally
Playground and sports field	A233 horn	Own zone, outdoor rated	IP66 and 30 W rated output for distance and ambient noise
Classroom door or stair lobby	A10W panel	Extension in the office call group	A call point without a desk; one alarm input for an external button
Gates and outdoor walkways	A12V	Extension in the site call group with anti-tamper alarm	IP66 and IK10 with a 4 MP camera for identity
Office and site office	X210i or A330i console	Paging control and answering position	106 or 116 DSS keys, gooseneck microphone, group broadcasting
Duty staff on the move	W611W handset	Portable extension with PTT	Reaches staff before the announcement does

A zone plan is what keeps the announcement system usable: without it, every broadcast is campus-wide and staff stop listening.

Emergency calls and how they are answered

The A10W panel has one alarm input for an external emergency button, and a one-click call rings the host plus the call-group extensions.
The A12V outdoor station reports an anti-tamper alarm to the control centre if its cover is removed; the A11/A11V and i16S/i16SV intercoms carry the same behaviour.
Console phones double as the answering position: the A320i has 20 SIP lines and prioritised calls, and the A330i adds eight short-circuit inputs, one output and an RS-485 interface.
Terminals support ONVIF, so a call can be linked to a camera and reviewed on a VMS.
A mobile app can report an on-site emergency event and make live voice announcements to individuals or groups in the advanced paging tier.

Compliance, standards and local requirements

Emergency call points and safeguarding

A school help point is a safeguarding device, so its position, its reachability and its answering procedure are policy decisions before they are technical ones. The published equipment gives the inputs and outputs — one alarm input for an external emergency button on the A10W, 8 short-circuit inputs on the A330i console, 2 in / 2 out on the A12V — but which points are required, how fast they must be answered and who holds the answering duty are set by the school and, in many countries, by education-department guidance. Confirm that procedure with the school's safeguarding lead and write it into the handover document.

Fire alarm and paging interfaces

Where a public address system is also used for emergency announcements, the interface to the fire detection system and the priority of an alarm announcement over a routine one are regulated locally. The published capabilities that matter are up to 20 multicast zones with prioritisation, one-key alarm activation, alarm light flashing and simultaneous calling to the management unit, and short-circuit inputs on consoles and gateways (PA2S has one built-in relay plus one input and one output; A330i has 8 inputs and 1 output). Have the fire interface designed and signed off by the site's fire contractor — it is not a feature that can be added after handover.

PoE budgeting, cabling and outdoor ratings

Speakers, panels and consoles are PoE devices, so the switch budget has to cover them: FH-S01 to IEEE 802.3af, A212 published as PoE 8 W / PoE+ 15 W, PA2S to IEEE 802.3af, PA3 to PoE/PoE+ with 12–24 V 2 A DC as an alternative. Outdoor positions must match the site: A233 is IP66 for a playground, A12V is IP66 and IK10 from −40 °C to 70 °C with an anti-tamper alarm, and i16S/i16SV is IP65 from −30 °C to 60 °C. Cable classes and separation rules are local; confirm them before first fix.

No certification claimed — check the local rules

The published material records no certification for these products, and this page does not claim one. Whether a school announcement system must meet a national standard, how long camera and intercom images may be retained, whether announcements may be recorded, and what notice pupils and parents receive are all local determinations. A compliant design is one where the school's own compliance owner has confirmed the requirement against local law and education guidance — use this page as the technical input to that review rather than its conclusion.

Standards referenced

Frequently asked questions

Can we keep the existing PA cabling and speakers?

Yes. The IP endpoint tier is stated to bridge legacy paging systems into the IP environment, and the PA3 and PA2S gateways drive passive speakers and legacy analog horn speakers. The choice is full IP or hybrid, not rip and replace.

Can announcements be scheduled?

Yes. Scheduled broadcasting uses custom time templates, real-time text-to-speech covers typed messages, and the A201 and A212 speakers keep an offline timed broadcast running on their own.

How do we cover a sports field without disturbing lessons?

As a separate zone. The A233 horn is IP66 with 30 W rated output and registers as its own multicast zone, so a field announcement does not have to reach the classroom corridors, and up to 20 zones with prioritisation can be managed from the console.

Can the same system handle our office calls and the site paging?

Yes. Staff desk phones, consoles, speakers and call points all register to one PBX — 62 SIP trunks on the OM50G, 496 on the OM200G and 1000 on the OM1000-UC — with one dial plan and one set of call records.

Is there a record of what was announced?

Where the paging tier provides it, audio archiving automatically records SIP paging, intercom and calls, available online for review or download. Call detail records can also be pushed to an external server on port 1809.

Project evidence

We have not published a named reference project on this page. The site does not carry customer names or installation records until the client confirms in writing which projects may be made public.

Page author: NEXVIA EngineeringPublished:2026-09-29Last updated:2026-10-13

Covers: school intercom · school intercom system · intercom system for schools · paging system for schools · school public address system

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