Frequently asked questions
The questions we are asked most often while a system is being configured, grouped by product range and by the way projects are planned on this site. Every answer here is the same text published on the matching product, application or reference-design page — nothing is written specially for this page, and where the source material does not state a figure, the answer says so rather than estimating.
IP PBX Systems
How many extensions can the system support?
The product manual does not state a maximum number of IP extensions for any model in the range, so we do not publish one. Published capacity is given in SIP trunks — from 24 on the OM20G to 1000 on the OM1000-UC. Tell us the extension and trunk counts for your site and we will confirm the right model.
Do these systems work with ordinary SIP phones from other brands?
Yes. Extensions register over standard SIP, and the system supports SIP signalling over UDP or TCP, plus TLS. DTMF runs as RFC2833, in-band or SIP INFO, and the codec list covers G.711, G.729A, G.722 and G.722.2.
How do I connect a fax machine?
A fax machine connects to an FXS port, on the PBX or on a gateway registered to it. Faxing runs as T.38 or G.711 pass-through — over an analog line G.711 pass-through is required, and where both sides support T.38 that is the recommended mode.
Can several sites share one dial plan?
Yes. Multi-site networking supports either network-wide unique extension numbers or repeatable numbers distinguished by a site prefix. One site acts as the management site and needs a fixed IP address; the others register to it.
Is there redundancy?
Only the OM1000-UC supports dual hot standby. On the other models, redundancy comes from the network design — analog lines as an escape route, and a backup SIP server configured with a fixed address or DNS SRV.
SIP Desk Phones
How many SIP lines should a desk phone have?
Match it to how the desk is used. Two lines suit a single occupant (X2P, X301 group). Four lines suit a reception or a small team desk (V61 group, X303 group). Six to twelve lines suit a desk answering for a group (V63, X3U, V64, V62 group, X4U). Sixteen to twenty lines suit a supervisor or a heavily shared position (X5U, X6U, V65, V66, V67, X7A, X7C, X210, X210i).
Do these phones work with the IP PBX systems on this site?
Yes. Every model registers as a SIP extension over the network, using the same dial plan as the PBX, and the wall models register exactly like the desk models.
Which models have Wi-Fi built in?
Built-in Wi-Fi is stated for the V66, V67, V65, V64, V61W, V62W, V60W, X7A, X301W and X303W. Wi-Fi 6 specifically is stated for the V66, V61W, V62W and V60W. Others, such as the X7C, X210, X210i, X6U, X5U and X4U, take Wi-Fi through a dongle.
Are the phones powered over Ethernet?
PoE is stated for most of the range, including the whole XU Series and the X301G, X303G and X303W. It is not stated for the base X301 and X303, for the X301W, or for the V66. No PoE class is published for any model, so confirm the switch budget on the quotation.
Can a desk phone be wall-mounted?
Desktop and wall mounting are stated for the V67, V66, V65, V64, V63, the V62 and V61 groups, the XU Series and the X300 Series. The V50 and V60 groups are wall-mount only, with the optional WB107 bracket. Mounting is not stated for the X2P, X7A, X7C or X210.
Hotel Phones
Do these phones integrate with a hotel PMS or room-status system?
The product materials for this range do not document a PMS or room-status interface, so we do not claim one. What is documented is the service-key set — including a wake-up call service key on the H6W and H602W — and SIP registration to an IP PBX. Tell us the system on site and we will confirm what can be done.
What is the handset cord length?
The materials do not state a cord length for any model in this range, so we do not publish one. Tell us the length you need and we will confirm it before you order.
Which models have a screen?
The H5W has a 3.5-inch (480×320) colour screen and the H6W a 3.5-inch (320×480) colour screen. Screens are not stated for the other models in the range.
Can the service keys be re-labelled for our hotel?
The keys are programmable, and the H3W, H4W, H602W and H603W also support faceplate customisation, so the printed names can match your services. The final key plan is confirmed on the quotation.
Do the phones work if the property has no Wi-Fi?
Yes. Five models take power and data over the network cable, so they do not need a wireless network at all. The Wi-Fi radios are an option for rooms where pulling a drop is difficult.
Wireless & DECT
DECT or Wi-Fi — which should we specify?
DECT gives you a dedicated radio band and your own base stations, which suits sites that need predictable coverage and high call counts. Wi-Fi handsets use the wireless network already installed, which suits sites with good Wi-Fi and staff who need data devices too. Both register as SIP extensions on the same PBX.
Why do the battery figures differ between models?
Because the batteries differ. The W610D is quoted at 8 h / 160 h, the W611W at 9 h / 200 h from a 1900 mAh battery, and the W620W at 13 h / 240 h from a 3000 mAh battery. All the figures are internal lab test data; real time depends on use.
How many bases will our building need?
That depends on the site. One W710H base is documented for up to 30 handsets and 16 simultaneous calls, with coverage up to 100 m indoors (US figures). Tell us the floors, the walls and the handset count and we will size the system.
Can we bridge an existing radio fleet to the phone system?
Yes — that is what the W712 RoIP gateway does. It carries a UHF 400–470 MHz radio module and speaks SIP, with group calls between radios and SIP phones.
Door Phones & Intercom
Will these door phones register to an NEXVIA IP PBX?
Yes. All three register over standard SIP, and the OM series IP PBXs on this site take SIP extensions. The A12 and A12V are documented as compatible with major IP PBX and IMS platforms.
Do these products need PoE?
It depends on the model. PoE is documented on the A10W panel, which also takes 12V/1A DC. For the A12V and the i67, PoE is not stated in the materials, so we do not claim it — the power arrangement is confirmed on the quotation.
How is the door actually released?
On the i67, access is by five credential methods plus remote door opening from the mobile app. The A10W has a built-in relay and short-circuit I/O, and the A12V has one access control channel with two short-circuit inputs and two outputs. Lock hardware and wiring are confirmed per project.
Can we add an indoor unit or a guard station?
The residential solution materials pair door phones with indoor stations and guard stations, so a door call can be answered inside or at a desk. Those units are quoted separately — tell us how many answering points you need.
Nurse Call & Care
Which parts of the system are wireless?
The call points. The KT10 pendant and the KT30 bathroom pull cord work on 433 MHz with a 6–25 m working range; the KT31 pull cord is the wired bathroom option, connected to the Y501 series intercom. Phones and consoles are wired over the network with PoE.
How many beds can one nurse console serve?
The deck proposes one console for a 70-bedroom nursing home and one for a 50-bedroom clinic plan, with up to 100 devices connectable to a console. Those are planning figures from the source material — send us your room count and shift pattern and we will size the system properly.
What happens when nobody is at the nurse station?
Four things are stated: the call type is repeated in colour and flashing pattern, incoming calls are amplified through the room speakers, the corridor display shows the call, and calls can be transferred to a portable Wi-Fi handset. Emergency calls also require a password before they are connected.
Can we keep the analog handsets already in the rooms?
An existing analog phone can be put back into service with an ATA gateway — one FXS port and two SIP lines per gateway. It sits in the conference and accessories range rather than here, and we quote the gateway count with the rest of the system.
Which protocols does the range use?
SIP for the room phones and consoles, 433 MHz radio for the KT10 and KT30 buttons, DTMF handling on the ATA gateway, and an RS-485 interface plus short-circuit inputs and output on the A330i console. Each protocol is tied to the model that states it.
Public Address & Paging
Do we need a server for a SIP public address system?
Not necessarily — that is the point of the three tiers in the source material. The advanced tier uses a server (cloud or on-premise) for multi-site management and text-to-speech. The light tier is serverless: a console IP phone is the built-in management platform and terminals are added by automatic discovery. The endpoint tier is stand-alone IP endpoints that integrate with a SIP platform you already run.
How many zones can the system have?
The speaker models are documented with up to 20 multicast zones, with prioritisation stated on the wall speaker and the FH-S01. Zone management sits in the light tier and dynamic zone control in the advanced tier. Send us the zone list and we will map it to the platform.
Can we reuse our analog speakers and cabling?
Yes. The gateways are the bridge: the PA2S has a line out for an external active speaker and the range legacy analog horn speakers are driven by the PA3 and PA2S gateways. The endpoint tier can also bridge existing analog broadcast cabling into IP, so full-IP and hybrid systems are both possible.
How are the endpoints powered?
PoE on the network cable is the norm, with DC options: 12 V–24 V 2 A DC on the gateways, DC on the speakers, and PoE or DC on the video speaker. The A212 output follows the supply (PoE 8 W versus PoE+ 15 W in one source, IEEE 802.3at in another), so confirm the switch before ordering.
Does the system integrate with cameras and VMS?
Yes. The IP devices support ONVIF so they connect to third-party VMS platforms, and AI-camera events such as intrusion or loitering can trigger pre-recorded announcements. The A513W adds a 4 MP camera with IR night vision in the same unit.
Conference & Accessories
Do I need a PBX to use these products?
It depends on the device. The GA10 ATA gateway holds two SIP lines and is designed to register to an IP telephony system such as the OM series on this site. The CA600, CA400, CM60 and DH401B are documented with connection through USB, Bluetooth or the network rather than with a stated SIP line count, and the PN1 is a cabling device rather than a call terminal.
Can the meeting room and the desk phones run on one system?
The room devices join over the network and sit alongside the extensions. Tell us how the room should reach the PBX and we will confirm which arrangement the current documentation supports.
Which products are sold as kits?
Only the CA400, which is documented as three units: the RC10 Receiver Hub, the CM70 UHD Camera and the MS10 Screen-Sharing Speakerphone. Everything else on this page is quoted as an individual item.
What about the 2-wire switch and the larger converter models?
The same 2-wire documentation also covers a switch for up to eight two-wire devices (PN8) and a 1U model for up to 24 devices (PN24). They are quoted separately — send us the building layout and the device list and we will size them for you.
Why are some models missing from this page?
We publish a product page only where the range provides a usable product photograph. Several models in the wider conference range — including the CS20 and CS40 speakerphones, the DB20 station and the DH301B, DH602B and HT301 headset families — are documented but have no image asset in the library, so they are quoted on request rather than listed here.
Applications
Are these real customer projects?
No. Every plan on these pages is a reference design built from the published capacity and product facts in our documentation, including the two sized care deployments printed in the manufacturer material. No customer or project is named.
Why is capacity quoted in SIP trunks rather than extensions?
Because the product manual does not state a maximum number of IP extensions for any model in the OM range. Published capacity is in SIP trunks — 24, 62, 216, 496 and 1000 across the five models — with up to 120 concurrent calls per trunk on the analog models and 200 on the OM1000-UC.
Can a design be adjusted to our building?
Yes. Send us the area counts (rooms, desks, wards, zones), the outside lines you hold and the state of the cabling, and the model, port mix and endpoint list are confirmed on the quotation.
This is a reference design prepared from the product datasheets, not a record of a named customer installation.
Projects
Does the list include switches and cabling?
No — those are site-supplied. Our own setup guide names a PoE switch as one of the three items a deployment needs, alongside the IP PBX and the IP phones, so budget a PoE switch on each floor and size it to the 41 powered devices plus spares.
What keeps calls running when the network drops?
Three things in this design: the analog lines on the FXO ports, the ETH2 redundant port that takes over in about 1.75 seconds, and the backup SIP server mode, which can be set to a fixed address or to DNS SRV. Power backup for the equipment room is a site decision and is not part of this equipment list.
How does the branch site fit in?
It joins through multi-site networking as a normal site, with the head office as the management site on a fixed IP address. Choose unique numbering if you want prefix-free dialling, or repeatable numbering with a site prefix if the branch manages its own ranges. Sites authenticate by IP address, or by IP address and port where the port is fixed.
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.
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
Page author: NEXVIA EngineeringPublished: Last updated: