01
Outside lines
SIP trunks over the internet, or analog lines on FXO ports where the site keeps them.
6line-selection modes decide which route an outbound call takes
Manufacturer & system integratorDesign · Supply · Commissioning · Support
IP PBX, SIP phones, intercom and paging
designed, supplied, commissioned
One integrator for the whole chain: we size the system for the building first — extension plan, trunk count and endpoint list — then supply the PBX and every endpoint from a single place and commission it as one system. From 24 SIP trunks in a small office to 1000 across a multi-site estate.
- SIP trunks
- 24–1000
- Analog ports
- 0–96
- Product families
- 8
- Scenario designs
- 21
System design
Extension plan, trunk count and endpoint list worked out against the building before anything is quoted.
Equipment supply
PBX, phones, intercom, nurse call and paging hardware from one supplier, configured as one system.
Commissioning
Provisioning, dial plan and integrations set up so the system is closer to working on arrival.
Technical support
Wiring, configuration and fault-finding help by email and WhatsApp after handover.
How the system fits together
Three layers, and every model number on this site belongs to one of them. That is the whole architecture — the sizing question is only ever how many lines come in and how many devices hang off the core.
02
IP PBX core
One system holds the dial plan, extensions, groups, voicemail, recording and the route table.
24–1000SIP trunks, decided by which of the models fits the site
03
Endpoints
Desk phones, hotel handsets, wireless handsets, door stations, ward terminals and paging speakers all register to the same core as extensions.
7endpoint families, all registering to the same core
Product families
Eight ranges, 72 models. Start from the exchange if you are building a system, or from the endpoint if you are replacing one.
IP PBX Telephone Exchange Systems
Five models spanning 24 to 1000 SIP trunks, with analog ports from zero to ninety-six. One of them fits the site — the comparison below shows which.
5 models
SIP Desk Phones — V, X, XU and X300 Series
Twenty-nine desk and wall phones spanning 2 to 20 SIP lines, screens from a 2.3-inch monochrome panel to a 7-inch Android touch screen, and wireless either built in or added by an adapter. Every one registers as a SIP extension.
29 models
Hotel Phones for Guest Rooms
Seven guest-room handsets built around one-touch service keys, with Wi-Fi 6 options, USB charging, PoE and one cordless model. The table below puts the differences side by side.
7 models
Wireless Phones and DECT Systems
DECT and Wi-Fi handsets, a multi-cell DECT base and a radio-over-IP gateway in one range. The table shows how the five differ on radio, capacity and battery.
5 models
Door Phones and SIP Intercom Terminals
Three entrance products: a wall panel for the door beside a room, an outdoor station for gates and posts, and a face recognition door phone for apartment and office entrances. All three register over SIP.
3 models
Nurse Call & Care Room Systems
From the pull cord in the bathroom to the console at the nurse station: bed-side and bathroom call points, big-button room phones, the Android consoles that answer and log the calls, and the entrance station that watches the door.
9 models
SIP Public Address, Paging & Emergency Broadcast
SIP paging gateways, ceiling and wall speakers, a video speaker and the desk phones that trigger the announcements — deployable as a server-based system, a serverless one managed from a console phone, or stand-alone IP endpoints.
8 models
Conference, Headset and Wiring Accessories
Six products for the rooms and the desks around a phone system: an all-in-one conference terminal, a wireless conference kit, a USB camera, open-ear Bluetooth earbuds, an ATA gateway for analog phones and a 2-wire converter for retrofit cabling.
6 modelsIP PBX Telephone Exchange Systems
| Model | Analog ports | Max SIP trunks | Hot standby |
|---|---|---|---|
| OM20G | 4 | 24 | — |
| OM50G | 12 | 62 | — |
| OM80E | 48 | 216 | — |
| OM200G | 96 | 496 | — |
| OM1000-UC | 0 | 1000 | ✓ |
What the wiring actually looks like
Uplink to the internet, PSTN lines, analog phones and grounding all land on the same chassis. Getting these four right first is what makes the rest of the deployment straightforward.
- Internet uplink through the router or ONU on the WAN port
- Analog lines on the FXO ports, kept as a local escape route
- Analog phones and fax on the FXS ports, numbered from 200
- Grounding and power on dedicated terminals, with the ground point used
Applications
A hotel, a ward and an open-plan office need the same core with different endpoints. Each page below lists the device plan area by area and the configuration by size.
Hotel Phone Systems — guest rooms, front desk and wake-up calls on one IP PBX
Guest rooms, front desk and wake-up calls on one IP PBX.
Hospital Phone Systems — ward calls, nurse call and site telephony on one IP network
Ward call points, nurse consoles and site telephony on one network.
Nurse Call Systems — the call chain from pull cord to the carer who answers
Call points, corridor indication, console and portables as one chain.
Office Intercom Systems — desk, door and wireless intercom on one business PBX
Desk, door and wireless intercom on one business PBX.
Door Entry Systems — entrances, apartments, the guard desk and the lift on one SIP system
Entrance stations, indoor units, guard desk and lift control.
School Intercom Systems — staff phones, campus paging and one-touch emergency calls
Staff phones, campus paging and one-touch emergency calls.
Reference configurations
6 worked designs with a complete equipment list — an office, a hotel, a clinic, a nursing home, a multi-floor enterprise and a campus broadcast system. Each one is a reference design built from the product datasheets.
Small office — a 50-extension reference configuration
Up to 50 extensions with eight analog ports kept for fax and existing handsets.
- Site type
- Single site, one or two floors
- Extensions
- 50 — 42 SIP and 8 analog
120-room hotel — reference configuration
Guest-room handsets with named service keys, bathroom phones and a PMS link.
- Guest rooms
- 120
- Room-side extensions
- 180 — 120 room phones and 60 bathroom phones
50-bed clinic — reference configuration
Bedside and door-side stations, a pull cord in every room, one nurse console.
- Beds
- 50 — 10 four-bed rooms and 5 two-bed rooms
- Rooms
- 15
70-bed nursing home — reference configuration
Seventy bedside stations in forty rooms, with corridor lights and caregiver handsets.
- Bedrooms
- 70 — 10 single, 60 in two-bed rooms
- Rooms
- 40
300-extension office — reference configuration
A thousand-trunk SIP core, 300 desks over four floors and a branch on the same dial plan.
- Floors
- Four, plus a branch site on the same network
- Extensions
- 300
Campus public address — reference configuration
Fourteen zones, seventy SIP speakers and ten emergency call points on one network.
- Buildings and areas
- Three buildings plus outdoor areas
- Zones
- 14
Why buyers work with NEXVIA
One supplier for the whole chain
The PBX, the phones, the intercom, the paging and the accessories come from one place, so the extension plan, the cabling and the power budget are consistent.
Sized before it is quoted
Extension count, trunk count and endpoint count are worked out first, then the model is chosen. The system planner does that arithmetic in the browser.
Specifications straight from the datasheets
Every published figure comes from the product documentation. Where a manual does not state a value, the page says so instead of filling the gap.
Configuration help before shipping
Extension plans, provisioning files and interface language can be prepared before dispatch, so the site is closer to working on arrival.
- IP PBX telephone exchange systems (OM series)
- SIP desk phones and call-centre phones
- Hotel and hospitality phones
- Wireless DECT and Wi-Fi handsets
- Nurse call and ward intercom terminals
- SIP door phones and building intercom
- IP public address, paging and emergency broadcast
- Conference terminals, headsets and 2-wire products
About Us
Manufacturing & Quality Control
Production runs across a dust-free workshop, SMT mounters, PCBA processing, assembly lines and warehouse logistics. Electrical and functional tests are performed before packing, and each batch is traceable by model and production order.
- 17y+
- Industry Experience
- 6
- Subsidiaries
- 4
- Business Lines
- 2009
- Founded
Blog
Notes from planning and configuring IP telephony systems — sizing by SIP trunks, line selection, cabling, codecs and the tests before handover.
Fax
Fax over IP: T.38 against G.711 pass-through
Why fax fails on a working voice call, which of the two modes fits which line, the speed defaults that matter, and how to number the fax extension.
8 min read
Cabling and power
PoE planning for a floor of SIP phones
Which models state PoE and which do not, where the published consumption figures sit, how to size the switch, and why port speed matters too.
8 min read
Networking
NAT, STUN and remote SIP extensions
What breaks when a phone or the PBX sits behind NAT, the punch-through and port-mapping routes, and the two headers that fix one-way audio.
8 min read
Frequently asked questions
How many phones can the OM20G run?
The manual does not state a maximum number of IP extensions, so we do not publish one. What it does state is a maximum of 24 SIP trunks and up to 120 concurrent calls per trunk. Send us your extension count and we will confirm the right model.
Can it keep working during an internet outage?
Yes, in two ways. Analog lines wired to the FXO ports keep working directly, and outbound SIP calls can be set to fall back to an analog line automatically when the trunk fails. The OM20G can also dial out through a 3G/4G USB modem.
Does it record calls?
It records to its own 16 GB storage and to a remote recording server — the only models in the range that record locally are the OM20G and OM50G. Recording codecs are G.711 and G.729.
Planning an IP telephony project?
Send us the site type, the number of extensions or rooms and the areas to cover — we will come back with a configuration and quotation.
- Email: sales@ipphonefactory.com
- WhatsApp: +8613922702227
- Address: IPPhone Office, Room 307E, Huilange BLDG, No. 273, Huangpu Blvd W, Tianhe District, Guangzhou, Guangdong 510620, China
Send the site details
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.
- Reply within one working day
- Configuration + quotation for your site
- Your details are used only to answer this inquiry
Not sure which IP PBX size you need?
Work out extensions, trunks and endpoint counts before you specify the hardware.
Page author: NEXVIA EngineeringPublished: Last updated: