Cloud phone systems
Cloud Phone Systems for Business: What They Cost and How They Work
- Understand
- Price
- Compare
- Install
A cloud phone system runs your business phones from a provider's data centers over your internet connection instead of a PBX in the closet. This page explains how it works, what providers charge per user, how a cloud PBX compares with UCaaS and SIP trunks, what happens when the internet drops, and how our Irvine team installs one.
01 The basics
What is a cloud phone system?
One product, many names. Here is what each means and the three ways we deliver it.
Cloud phone system: A business phone service that runs in the provider's data centers and reaches your desk phones, computers and mobiles over the internet. You manage it in a web portal and pay per user each month; nothing but the handsets and the network stays in your building.
Vendors sell the same thing as a cloud phone system, a cloud based PBX phone system, a hosted phone system, cloud VoIP or UCaaS. The differences are small and worth knowing, because they decide what is on the bill and what is not. The glossary entries below take each name apart; the rows after them are the three ways Telxpress delivers a system, from fully cloud to internet lines on a PBX you keep.
- 01
Cloud PBX, hosted PBX, hosted VoIP
The call control (extensions, auto attendant, queues, voicemail) running in the provider's cloud. Three names for the same thing; "cloud based PBX phone system" is the long form.
- 02
UCaaS
A cloud PBX with video meetings, team chat and texting in the same app and the same bill. Most current cloud phone systems are sold this way.
- 03
VoIP
The technology underneath all of them: calls carried as data over the internet. "Cloud VoIP" and "VoIP cloud phone system" are the same product as a cloud phone system.
- 04
SIP trunk
Internet phone lines connecting a phone system you own to the public network. The PBX stays in your building; only the lines move to the internet.
Three ways to get there
- 01
Cloud phone system (hosted VoIP or UCaaS)
The provider runs the call control in its data centers. Your desk phones, computers and mobiles register to it over the internet, every feature is set in a web portal, and you pay per user each month. Nextiva is one of the platforms we install, usually with Yealink handsets.
- 02
Hybrid: cloud and on-premises together
An on-premises PBX (Yeastar, Avaya) keeps the building, its paging and door intercoms running while remote staff and new locations live in the cloud. The two share a dial plan, for a transition or for good.
- 03
SIP trunks to the PBX you keep
Internet phone lines replace the analog lines or the PRI circuit feeding a PBX you still like, cutting line costs and adding capacity without touching handsets or call flows. Not a cloud phone system, but often the first step toward one.
For the project itself, read our business phone systems page and the step-by-step PBX to cloud migration plan. For the platforms side by side, see Nextiva vs RingCentral vs 8x8.
02 Pricing
How much does a cloud phone system cost?
The per-user price is the headline. The invoice has six more lines, and the building adds a few of its own.
As of November 2026, from the providers' own pricing pages: Nextiva lists its NEXT Core plan at $15 per user per month and NEXT Engage at $25 on the annual small-business price, which applies to new customers with 1 to 100 employees on a 12-month or longer term; RingCentral lists RingEX Core at $20 per user per month billed annually or $30 billed monthly, Advanced at $25 or $35 and Ultra at $35 or $45, with unlimited calling limited to the US and Canada and taxes, 911 and regulatory recovery fees extra; Zoom Phone lists US & CA Unlimited at $16 per user per month billed annually or $18 monthly and Pro Plus at $20.50 or $24.
Dialpad lists Standard at $15 and Pro at $25 per user per month (the page does not say which billing term those prices assume); Ooma Office lists Essentials at $19.95, Pro at $24.95 and Pro Plus at $29.95 per user per month with no contract, a one-time $29.95 activation fee, and taxes and fees not included; GoTo Connect publishes no prices and quotes through sales. Read these as the shape of the market on the day we checked, not as a quote: plans change often, the lowest price usually needs an annual term and a minimum tier, and the headline excludes everything in the table below.
Four things move the bill most: how many users and shared lines you have, the term you sign, which features sit in a higher tier or an add-on (texting caps, toll-free minutes, call recording, the AI receptionist), and what your building needs before the phones work (switches that power them, a voice network, a backup connection).
| Cost item | What it is | How it is billed | Check before you sign |
|---|---|---|---|
| Per-user plan | The monthly licence for each person or shared line, in tiers that add toll-free minutes, texting, integrations and AI features | Monthly per user; the annual-term price is lower than the month-to-month price | Which tier has the features you need; whether the price shown assumes an annual term; what the price becomes at renewal |
| Taxes, fees and surcharges | Federal and state taxes, 911 fees and regulatory recovery fees added to the plan price | Monthly, as line items on the invoice | Ask for a sample invoice for your user count and address before you sign |
| Numbers and porting | Keeping your existing numbers, adding local or toll-free numbers | Usually included for the main numbers; extra numbers monthly | Who files the port, and how the old system stays live until it completes |
| Desk phones and headsets | SIP handsets, conference phones, cordless handsets for warehouses and workshops, headsets | One-time purchase, or rented on a multi-year contract | Whether the Yealink or Polycom phones you own are certified for the platform and can be reused |
| Network and internet | PoE switches to power the phones, a voice VLAN with QoS, enough bandwidth, often a second internet connection for failover | One-time for equipment and installation; monthly for a backup circuit | Run the bandwidth calculator and have the network assessed before the phones arrive |
| Implementation and training | Call-flow design, auto attendant recordings, user setup, number porting, cutover and staff training | One-time, by the provider or by the local integrator | Who is on site on cutover day, and who you call the week after |
| Add-ons | An AI receptionist, extra text messages, more toll-free minutes, call recording storage, CRM integrations, contact-center seats | Monthly, per user or per usage | Price the add-ons you will actually use; several providers sell the AI receptionist separately |
Cloud against the PBX you have
A cloud plan is cheap to start and costs the same every month for years; an on-premises PBX costs more on day one and less after it is paid for, until its lines, maintenance and licence renewals catch up. The honest comparison is over five years with your own numbers, which is what the free cloud phone vs PBX cost calculator does: it shows its formulas and uses no figures but yours.
What Telxpress charges
We quote the provider's plan at its published price and list the handsets, the network work and the installation as separate lines, so you can see which part is monthly and which is one-time, and which you could skip. The quote follows a short assessment of your calls, lines and network, because the building usually decides more of the cost than the plan does. Book the consultation, or start with the free AI readiness assessment.
03 Comparison
Cloud phone system, on-premises PBX or SIP trunks: which fits your office?
The same ten questions asked of each option. Many offices run two of them during a transition.
| What matters | Cloud phone system (UCaaS) | On-premises PBX | SIP trunks to your PBX |
|---|---|---|---|
| Where the call control runs | The provider's data centers, managed in a web portal | A server or appliance in your telecom room | Your PBX, with internet lines instead of copper or a PRI |
| Upfront cost | Handsets, network work and setup; no server | The PBX, its licences, handsets and installation | A session border controller or firewall rules; the PBX you already own |
| Monthly cost | A licence per user, taxes and fees, any add-ons | Lines or trunks, maintenance, licence renewals | Per channel or per concurrent call, usually less than the lines it replaces |
| Remote and mobile staff | Built in: the same extension on a laptop or mobile app anywhere | Possible with VPNs or remote-phone licences; more to maintain | Whatever the PBX supports |
| When the internet drops | The service keeps running; calls follow your failover rules to mobiles, a second circuit or voicemail | Internal calls keep working; outside calls depend on the lines | Outside calls stop until the connection or the backup circuit is up; internal calls keep working |
| Adding users or a location | Add a licence and ship a phone; sites share one system | Capacity planning, sometimes new hardware or a second system | Add channels; the PBX sets the limit |
| Video meetings and team chat | Included on UCaaS plans | Separate tools | Separate tools |
| Connecting Donya, our AI receptionist | Routing rules send calls to Donya by line, time or overflow | Through a SIP trunk or forwarding, with more setup | Through the trunk, with routing on the PBX |
| Who maintains it | The provider for the platform; Telxpress for phones, network and changes | Your IT team or Telxpress under a support agreement | Your PBX maintainer plus the carrier |
| Best for | Offices with remote staff, several sites or plans for AI call handling | A single site with mostly desk-bound staff and strict on-site control | A PBX you still like, with lines that cost too much |
The on-premises PBX, hosted VoIP and UCaaS table on the phone systems page covers the same ground from the project side, and the features to look for in a VoIP provider goes deeper on the platform itself.
04 Reliability
What happens to a cloud phone system when the internet goes down?
The question every buyer asks before the move, and the one most providers answer vaguely. Here is the plain version.
The phone system itself does not go down. It runs in the provider's data centers, which have their own redundant connections, so callers still reach your numbers and the auto attendant still answers. What changes is where the calls can ring. Desk phones in an office with no internet cannot register, so the calls follow your failover rules instead: to the mobile apps, which work on cellular data; to cell phones through a forwarding rule; to voicemail delivered by email; or to another office.
Failover: The automatic switch to a second internet connection (cable beside fiber, or fixed wireless or 5G beside either) when the first one fails, handled by a dual-WAN firewall or an SD-WAN appliance so the desk phones re-register within seconds and nobody has to touch anything.
Offices that cannot afford a quiet hour add that second connection, put the switch, router and fiber terminal on a battery so a power blip does not take the phones with it, and test the whole path on a weekday. Our connectivity page covers failover circuits, and SD-WAN for small business explains when the appliance is worth it and when a dual-WAN firewall is enough. One more thing survives the outage only if someone planned it: 911. The dispatchable location registered for each phone has to be right wherever that phone is working from.
05 Before you buy
What should you check before buying a cloud phone system?
Eight checks, in the order the problems usually appear. The first two are law, the rest are money and sleep.
Two of the checks are federal rules, not preferences. Under Kari's Law and RAY BAUM's Act, implemented in 47 CFR 9.16, a multi-line phone system must allow direct 911 dialing without a prefix, notify someone on site when 911 is dialed, and send a dispatchable location with the call. Under the FCC's porting rules in 47 CFR 52.35, a simple port must complete within one business day; a business port with many numbers is not a simple port, which is why the cutover date waits for the carrier's confirmation.
- 01
911 that works from every phone
Direct 911 dialing with no prefix, a notification to someone on site when 911 is called, and a dispatchable location (building, floor, suite) registered for every phone and softphone, remote workers included.
- 02
Your numbers come with you
The provider files the port; the old system stays live until the numbers answer on the new one. Multi-line business ports take longer than the one-business-day rule for simple ports, so plan the cutover date around the carrier's confirmation.
- 03
Handsets you can keep
Yealink and Polycom SIP phones often re-register to a new platform when the provider certifies the model. Check the list before you budget new phones, and decide by role who needs a desk phone and who works from the app.
- 04
A network built for voice
PoE switches, a voice VLAN with QoS and enough bandwidth for every concurrent call. Wi-Fi softphones need a survey first. The free bandwidth calculator tells you what your call volume needs.
- 05
A failover plan you have tested
Where calls go when the internet drops: mobile apps, a second circuit with automatic failover, voicemail to email. Test it on a weekday, not during the outage.
- 06
Recording and consent in the greeting
California requires all-party consent before a confidential call is recorded or transcribed, so the greeting has to say so. Our free notice generator writes the line and the signage.
- 07
Integrations and AI call handling
The CRM, the calendar and Microsoft Teams if you use it, and where an AI receptionist connects. Donya answers on a line or extension of the system and transfers to your staff like any other extension.
- 08
A contract you can leave
The term, what the price becomes after it, auto-renewal, who owns rented phones, and how numbers port out. Then the support question: who answers at nine at night, the vendor's ticket queue or a local team.
06 How we work
How does Telxpress install a cloud phone system?
One local team from the first count of lines to the week after cutover. The old system stays live until the new one has proven itself.
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Assess
We count lines, numbers, handsets and call flows, check the switches, cabling and internet connection, and ask what callers and staff complain about. You get a plain recommendation: cloud, hybrid or SIP trunks.
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Design and quote
The plan tier, the numbers to port, the auto attendant and queues, the handsets by role, and the network changes, in a written quote that separates the monthly licence from the one-time work.
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Port and run in parallel
The new system goes live beside the old one. Your team tests real calls, 911 addresses are registered for every phone, and the numbers move on a date you choose. The old system stays until the new one has proven itself.
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Train and support
Short training for staff and admins, documentation handed over, and a support line answered 24/7 from Irvine. When you are ready, Donya joins as an extension.
We design, install and support Nextiva cloud systems with Yealink handsets, Yeastar and Avaya systems on premises or in a hybrid, and Polycom phones, and we quote the internet and failover circuits through our carrier partners. Clinics, law firms and property managers each have their own call patterns and consent rules; the dental, law firm and property management pages cover what changes for them.
07 Questions
Questions buyers ask about cloud phone systems
What is the difference between a cloud phone system and a cloud PBX?
Mostly the name. A cloud PBX, hosted PBX or hosted VoIP service is the call control running in the provider's data centers: extensions, auto attendant, queues and voicemail. A cloud phone system is that service with the phones and apps that use it. UCaaS adds video meetings, team chat and texting to the same plan.
How much does a cloud phone system cost per user?
Published list prices on the day we checked ran from the mid teens to the mid forties per user per month, depending on the tier and whether you sign an annual term. Taxes and 911 fees, desk phones, network work, implementation and add-ons such as an AI receptionist or extra texting come on top. The pricing section links the providers' own pages.
Do we need new desk phones for a cloud phone system?
Not always. Many Yealink and Polycom SIP phones can be re-registered to a new cloud platform when the provider certifies the model, and staff who work from a laptop or mobile may not need a desk phone at all. We check your current handsets against the provider's list before anything is ordered.
What happens to a cloud phone system when the internet goes down?
The service itself keeps running in the provider's cloud, so callers still reach your numbers. Your failover rules decide where the calls ring: mobile apps on cellular data, a second internet connection that takes over automatically, or voicemail delivered by email. Desk phones in the office stay up only if a backup circuit and power are in place.
Can we keep our phone numbers when we move to the cloud?
Yes. Your numbers are ported to the new provider, and the old system stays live until they answer on the new one. Federal rules require simple ports to finish within one business day, but business ports with many numbers take longer, so the cutover date is set around the carrier's confirmation rather than the other way round.
Does a cloud phone system meet the 911 rules in California?
It does when it is configured to. Federal law requires direct 911 dialing without a prefix, a notification to someone on site when 911 is called, and a dispatchable location for each phone, including softphones used by remote staff. We register the addresses during installation and review them when people move desks or work from home.
Next step
Get a Cloud Phone System Quote You Can Read.
Book a free 30-minute consultation and leave with a plain recommendation: cloud, hybrid or SIP trunks, the plan tier that fits, and a written quote that separates the monthly licence from the one-time work.
Last reviewed: . Published by Telxpress, Irvine, CA.