IP Telephony & SIP Communication Systems · Guangzhou, China
Scenarios · workplace
An office intercom system is not a separate box beside the phone system: on an IP PBX, intercom is what the extension dial plan already does. This page covers the four places intercom is actually asked for in an office — desk to desk, door to desk, the front desk to the whole floor, and staff who are not at a desk at all — with the models and the published figures for each. NEXVIA designs, manufactures, supplies and commissions the system; the PBX and terminals are manufactured by NEXVIA, including the terminal range used throughout this design.
For an office of 30 to 80 people, intercom is a configuration of the phone system rather than a second system: 30 to 80 desk phones as extensions, one 106-key console at reception for floor paging, 1 to 4 door intercom panels on the entrances, and 4 to 10 speakers for the zones that need announcements. The PBX behind it publishes 24 SIP trunks on the OM20G and 62 on the OM50G, so the intercom traffic rides on capacity the site already owns.
The three intercom behaviours that matter at a desk are: extension dialling between phones, group pickup across up to 32 departments, and ring groups that distribute a call sequentially, in rotation or simultaneously with up to 20 calls waiting in a queue. A call that is not answered within 24 seconds is routed to the operator position, which accepts up to 5 numbers.
Door and wireless positions complete the picture. The A10W panel fits a standard 86 box with three function keys, a 2W speaker with echo cancellation and one relay for the door strike, running on PoE or 12 V DC; wireless staff carry Wi-Fi 6 handsets with up to 16 DSS keys and a push-to-talk key, with a published 9-hour talk time on the W611W. Prices are not published on this site — every intercom design is quoted per position count and building.
A maximum number of IP extensions is not stated for any model in the range. Capacity is published in SIP trunks — 24 to 1000 — so the design conversation starts with how many outside lines the site needs and how many calls run at once, not with a seat count.
Sales floors and support teams share numbers. Ring groups in sequential, rotating or simultaneous mode, group pickup across up to 32 departments, and queues of up to 20 waiting calls are what keep a shared number answerable at busy times.
Fit-outs and hot-desking move faster than cabling. The V61W and V62W publish Wi-Fi 6 and Bluetooth 5.4, the WS210(P) runs on dual-band Wi-Fi with optional PoE, and the W611W and W620W handsets remove the cable from the position entirely.
A second entrance, a goods door or a car park gate appears after the plan is drawn. Because door panels are SIP terminals, an additional position is an extension and a cable run rather than a new system — but it still needs a cable route, a power decision (PoE or 12 V DC) and a place in the call group, so the design should leave spare capacity at each entrance.
| Size band | System | Devices | Notes |
|---|---|---|---|
| Up to 30 staff — studio or single-floor office | OM20G — 24 SIP trunks; 4 analog ports (4 FXS, 4 FXO or 2+2) | Around 30 desk phones (V61G / X3U), 1 reception phone (X210 or X6U), 1–2 door panels (A10W), 2–4 speakers (A201 / A212) | The OM20G is the only model in the range that can dial out through a 3G/4G USB modem. Ring groups hold up to 40 extensions on this model. |
| 30–80 staff — multi-room office | OM50G — 62 SIP trunks; up to 12 analog ports across 3 interface cards | Desk phones per position, 1 × X210i console, 2–4 door panels, 4–8 speakers across 20 multicast zones, 2–4 wireless handsets | Analog ports suit a fax line, a legacy line or an analog door entry that is being kept. No 3G/4G modem support on this model. |
| 80–300 staff — multi-floor office | OM200G — 496 SIP trunks; up to 96 analog ports on 24-line cards | Desk phones per floor, conference terminals, a console per floor or per wing, door panels at each entrance, speakers zoned per floor | 4 hot-swap card slots, gigabit Ethernet and single or dual AC/DC power. Ring groups hold up to 60 extensions, and PT2400 or PT4800 patch panels are named for the cabling. |
| 300+ staff or several sites | OM1000-UC — 1000 SIP trunks, up to 200 concurrent calls per trunk | Per-site counts repeated, one console per site, a shared dial plan with DID numbers where teams present one public number | SIP only, with dual hot standby (3 fixed IP addresses) and multi-site networking using unique or repeatable extension numbering. |
| Warehouse, workshop or yard attached to the office | OM200G — 496 SIP trunks | Wall handsets (V60G) in corridors and stores, an IP66 horn speaker (A233) outdoors, outdoor intercom (A12V) at the gate, portable handsets for staff on the move | Outdoor positions carry their own ratings — A12V is IP66 and IK10 from −40 °C to 70 °C, the A233 horn is IP66 with 30 W rated output — and the same PBX routes them. |
| Position | Model | Published capability | Connection and power |
|---|---|---|---|
| Entry door / reception side door | A10W SIP mini intercom | 3 function keys, 2W speaker with echo cancellation, 1 relay, 1 short-circuit in / 1 out, MP3 broadcast, works with KT10/KT20/KT30 buttons | Standard 86 box; PoE or 12 V DC; IP54; −10 °C to 50 °C |
| Main entrance / gate | A12V outdoor intercom | 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; 2 SIP lines; ONVIF and RTSP on the video model |
| Reception paging desk | X210i console | 106 DSS keys, 4.3-inch colour main screen plus two 3.5-inch side screens, group broadcasting, gooseneck microphone | Dual Gigabit, integrated PoE; Bluetooth 4.2; 20 SIP lines |
| Control room / facilities desk | A330i console | 116 DSS keys, 10.1-inch touchscreen, 92 dB speaker, 8 short-circuit inputs, 1 output and 1 RS-485 interface | Dual Gigabit, PoE; Android 14; built-in broadcast system |
| Corridor and open-plan zones | A212 wall / A201 ceiling speaker | Up to 20 multicast zones with prioritisation; A212 8 Ω up to 15 W class D with talkback; A201 two-way audio with offline timed broadcast | PoE; A212 published as PoE 8 W / PoE+ 15 W; A201 PoE, PoE+ or DC |
| Meeting rooms | CA600 / CA400 | CA600: dual 11-inch touch screens, 12-microphone 360° array, dual 10W speakers. CA400: three-piece wireless kit with 4K screen sharing | Network and USB-C respectively; conference terminals, not intercom endpoints |
| Staff who move between floors | W611W / W620W handset | 16 DSS keys plus a configurable push-to-talk key; W611W IP67, 1900 mAh, up to 9 h talk / 200 h standby; W620W 3000 mAh, up to 13 h / 240 h | Wi-Fi 6 dual-band 2.4G and 5G, Bluetooth 5.0 |
| Desks that move or have no cable | WS210(P) / V61W / V62W | Dual-band Wi-Fi; WS210(P) has 2 SIP accounts, 5 paperless programmable keys and PoE as an option; V61W and V62W publish Wi-Fi 6 and Bluetooth 5.4 | Wireless to the network; V61W/V62W additionally take PoE on dual Gigabit ports |
| Multi-cell cordless coverage | W710H base + W610D handset | Up to 30 handsets per base and 300 per system; 16 simultaneous calls per base and 200 per system; coverage 100 m indoor / 700 m outdoor (US figures, EU 60 m / 350 m) | PoE base station; DECT radio, so no Wi-Fi dependency |
| Requirement | Conventional analog intercom | This IP design | What changes operationally |
|---|---|---|---|
| Desk-to-desk call | Separate intercom wiring and handsets beside the telephone | Extension dialling on the same desk phone the office already uses | One instrument per desk; no separate intercom handset |
| Door release | A dedicated door-entry panel wired back to a lock | A10W panel with one relay, or A12V with 2 inputs and 2 outputs, on the same system as the phones | Door and phone are one system, so a door fault is visible at the console |
| Floor paging | A separate amplifier and a microphone at reception | Console broadcasting from the X210i or A330i to SIP speakers in 20 zones | Zones are addressed from a screen instead of mechanical selector switches |
| Bridging legacy paging | Replace the amplifier or keep it isolated | PA3 and PA2S gateways drive passive speakers and legacy analog horn speakers; the IP endpoint tier is stated to bridge legacy paging into the IP environment | The existing speaker line can be kept and extended zone by zone |
| Staff who are mobile | Radio handsets on a separate system | Wi-Fi 6 handsets with 16 DSS keys and a push-to-talk key on the same extensions as the desk phones; a W712 gateway puts UHF 400–470 MHz radios on the same system where radios stay | One number reaches a person, not a place |
| Pickup and coverage | Anyone at the intercom handset answers | Group pickup across up to 32 departments, ring groups in three modes, up to 20 waiting calls in a queue | A call to an empty desk is answered from the next one |
| Records | None, or a separate logger | Call detail records to an external server on port 1809; audio archiving of SIP paging, intercom and calls where the paging tier provides it | Announcements and calls can be reviewed |
| Area | Device | Note |
|---|---|---|
| Reception | X210i console / X6U phone | X210i: 106 DSS keys, 4.3-inch main screen plus two 3.5-inch side screens, gooseneck microphone and group broadcasting. X6U: three screens, 20 lines and 60 DSS keys where the desk handles the call traffic but not the paging. |
| Standard staff desk | V64 or X3U | V64: 3.5-inch 480×320 screen, 12 lines, dual Gigabit with PoE. X3U: 6 lines with three LED line keys, Gigabit PoE and IPv6. |
| Entry door | A10W SIP mini intercom | Fits a standard 86 box with three function keys, a 2W speaker with echo cancellation, one relay and one short-circuit in/out; supports KT10/KT20/KT30 buttons and runs on PoE or 12 V DC (IP54). |
| Main entrance or yard gate | A12V outdoor intercom | IP66 and IK10 from −40 °C to 70 °C, 4 MP camera with infrared night vision, 10W speaker with echo cancellation, 2 short-circuit inputs and 2 outputs, anti-tamper alarm to the control centre. |
| Corridor, open plan and canteen | A212 wall speaker or A201 ceiling speaker | Up to 20 multicast zones with prioritisation. A212 is 8 Ω with up to 15 W class D output and talkback (PoE 8 W / PoE+ 15 W); A201 adds offline timed broadcast and two-way audio, with its wattage confirmed on the quotation. |
| Meeting rooms | CA600 or CA400 | CA600: dual 11-inch touch screens with a 12-microphone 360° array and dual 10W speakers. CA400: the three-piece wireless kit (receiver hub, UHD camera, screen-sharing speakerphone) for rooms that run from a laptop. |
| Staff on the move | W611W / W620W handset, or W710H + W610D DECT | Wi-Fi 6 dual-band with 16 DSS keys and a PTT key (W611W IP67, 1900 mAh, up to 9 h talk); W620W adds a 3000 mAh battery (up to 13 h / 240 h). The DECT option carries up to 30 handsets per base and 300 per system. |
Yes, and on an IP PBX that is the normal design: intercom is extension dialling, so no additional hardware is needed beyond the handsets you already have. The PBX publishes 24 to 1000 SIP trunks across the five models, and intercom calls use the internal extension side of the system rather than a trunk.
It escalates in a defined order. A ring group tries the next extension after the configured ring time, a queue holds up to 20 waiting calls with a prompt, and a call that is not dialled through within 24 seconds goes to the operator position, which accepts up to 5 numbers.
Usually not. Broadcasting to analog extensions is supported by the PBX, and SIP speakers and paging gateways register on the same system, so a floor announcement is made from a console or an IP phone.
It depends on how far people walk. Wi-Fi 6 handsets (W611W, W620W) suit staff who stay inside the Wi-Fi coverage; a DECT multi-cell system (W710H base with W610D handsets) suits a building where coverage must be independent of the data network and up to 300 handsets are needed.
A door intercom panel calls an extension, a ring group or the reception desk, and the person who answers releases the door. The A10W fits a standard 86 box with three function keys and one relay; the A12V adds a 4 MP camera and two inputs and outputs for an outdoor or gate position.
Yes. Every desk phone in the V and X series supports a wired or EHS wireless headset, and the conference terminals double as hands-free audio for a team room. Headsets are a workplace-health decision as much as a technical one for staff who take intercom and call traffic all day.
Desk phones by position
| Position | Model | What the product data publishes |
|---|---|---|
| Entry desk | X301 / X301G | Two lines on a 2.3-inch dot-matrix display; the G version adds dual Gigabit ports and PoE |
| Standard desk | V61G / V61W | 2.4-inch 320×240 screen, four lines, dual Gigabit with PoE; the W version adds Wi-Fi 6 and Bluetooth 5.4 |
| Six-line desk | X3U | Six lines with three LED line keys, Gigabit PoE and IPv6 |
| Twelve-line desk | V64 | 3.5-inch 480×320 screen, 12 lines, dual Gigabit with PoE, up to 21 DSS keys |
| Heavy call handling | X7C | Five-inch screen with 60 on-screen keys and a SIP hotspot feature |
| Reception or manager | X6U | Three screens, 20 lines and five LED line keys |
| Paging console | X210i | 106 DSS keys across three screens with a gooseneck microphone |
| Meeting room | CA600 / CA400 | Dual 11-inch touch screens, or the three-piece wireless kit |
| Corridor or store | V60G / V50G | Wall-mount handsets with dual Gigabit ports |
Line and key counts are the published figures; where a model has no published figure, the model page says so rather than estimating.
Three wireless routes exist in this range and they solve different problems. A Wi-Fi 6 handset (W611W, W620W) is the fastest to deploy where the data network already covers the building, and it keeps the same extension number as the desk. A DECT multi-cell system (W710H base, W610D handset) gives coverage independent of the data network and scales to 300 handsets. A wireless desk phone (WS210(P), V61W, V62W) removes the cable from a position rather than from a person.
Coverage is the design input: walk the site and test where the handset must work before fixing the number of access points or base stations.
Intercom endpoints are network devices, so the cabling rules are the same as for the data network: terminated and tested runs, labelled outlets and a documented patch schedule. PoE has to be budgeted per switch, because a floor of desk phones, speakers and consoles can exhaust a switch faster than the port count suggests. Interface cards on the PBX connect to a patch panel over Cat5 Ethernet cable where analog ports are used, and 2-wire converters are available where no data cable exists.
Broadcasting to analog extensions is supported by the PBX, but two-way broadcast is not supported by the series — talkback is a feature of the speaker models that publish it, such as the A212. Emergency announcements, alarm activation and simultaneous calling to a management unit are part of the IP endpoint tier. Design the difference into the specification so an intercom position is not promised a talkback capability the model does not have.
Door release and emergency calls are security functions, not conveniences. A10W carries one relay and one short-circuit input; A12V carries 2 inputs and 2 outputs; A330i takes 8 short-circuit inputs, one output and an RS-485 interface. Decide what happens on a power failure, whether a lock fails open or closed, and who can release a door outside working hours. Those are site decisions to be confirmed against the local code and the site's own security policy.
Emergency-number dialling, privacy of recorded calls, cabling colour and separation rules, and the permitted mounting heights for call points are set locally, and none of it is uniform across countries. The published material behind this page records no certification for these products, and nothing here is a compliance conclusion. Confirm the requirements with the site's own engineer and, where the site is regulated, with its compliance officer before the equipment list is fixed.
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:Last updated:
Covers: office intercom · intercom phone · business intercom · office intercom system · wireless intercom system for office
All IP telephony, intercom and paging equipment in this design is supplied and integrated by NEXVIA.
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Six facts build a configuration: site type, extensions or rooms, simultaneous calls, areas to cover, existing lines and the documents you already hold. Send as many as you know — nothing has to be final before the first reply.
