What is the best VoIP phone system for a business in 2026?
Pick a VoIP phone system on three things: how good its apps are, what it really costs for your headcount, and what it logs in your CRM.
A VoIP phone system routes your business calls over the internet instead of a landline. Your team makes and takes calls from a desktop app, a mobile app or an IP desk phone, and the number follows each person wherever they work.
Our short answer: RingCentral for the most complete all-round system, Allo for a mobile team that wants AI answering with no setup, Aircall for sales and support teams that live in HubSpot or Salesforce, CloudTalk for calling customers in many countries, KrispCall for the lowest monthly bill, and 3CX if you want to host the system yourself.
Every cost on this page is worked out for 5 and 20 users, the size of most teams switching providers. Need a reception setup with queues and supervision for a larger company? Our virtual phone system ranking covers that case.
The ranking is editorial: a sponsored placement is always labeled on its card, and no affiliate link changes a score.
The best VoIP phone system for each team
Advanced at $25 per user, billed yearly
Mobile team that wants AIBusiness at $32 per seat, billed yearly
Sales and support in the CRMEssentials at $30, three licenses minimum
International callingNumbers in 160 countries
Lowest monthly billEssential at $12, minutes pay as you go
Self-hosted systemFree for up to 10 users
Six VoIP phone systems priced for 5 and 20 users
The price column shows the monthly bill for a team of five, then twenty, on the plan we recommend for everyday business calling. Rank follows what a team on the phone all day needs: app quality, real cost, CRM and AI. It does not copy the score.
| Best for | Why it stands out | Free plan | Team size | Visit | ||||
|---|---|---|---|---|---|---|---|---|
| 1 | RingCentral | Best all-round | Phone, CRM links and multi-site in one plan | 3.7/5 | Advanced: $125 for 5, $500 for 20 | — | 5 to 500 users | Visit → |
| 2 | Allo | Best for mobile teams | Mobile-first app, native CRM sync | 4.4/5 | Business: $160 for 5, $640 for 20 | — | 2 to 50 users | Visit → |
| 3 | Aircall | Best with HubSpot or Salesforce | Caller record pops on screen | 3.2/5 | Essentials: $150 for 5, $600 for 20 | — | 3 to 200 users | Visit → |
| 4 | CloudTalk | Best for international calling | Local numbers in 160 countries | 3.3/5 | Essential: €145 for 5, €580 for 20 | — | 5 to 100 users | Visit → |
| 5 | KrispCall | Best on a tight budget | Low subscription, usage-based minutes | 3.8/5 | Essential: $60 for 5, $240 for 20, plus minutes | — | 1 to 20 users | Visit → |
| 6 | 3CX | Best to self-host | Your own PBX, any SIP carrier | 3.5/5 | $0 license for 5; paid yearly license above 10 users | ✓ | Teams with IT staff or a reseller | Visit → |
Monthly cost on annual billing where the vendor shows it. Public list prices, before taxes and fees. CloudTalk publishes its plans in euros. Aircall needs three licenses at minimum.
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How we compared these systems
Most roundups on this question are written by a vendor that ranks itself first, or list a dozen names with a single "from" price. Almost none tell you what a full team pays, how many licenses you must buy, or how much bandwidth a call needs.
We read each vendor's official pricing, license minimums and paid add-ons, then hundreds of user reviews, looking first for what breaks day to day: flaky mobile apps, choppy audio, surprise renewals. Scores for Allo, Aircall, CloudTalk and KrispCall come from our full reviews; RingCentral and 3CX keep the scores from our other rankings, so a tool has the same score everywhere. Allo has the top score but sits second: it does less than RingCentral for a twenty-person office with several sites.
Four tools get a mention. Quo (formerly OpenPhone) is a strong pick for very small US teams, from $15 a user on yearly billing. Zoom Phone and Teams Phone make sense when you already pay for that video suite. Dialpad lists $15 and $25 plans, with CRM links on the higher one. For a real agent floor, see our call center software ranking.
- Features and depthApps, IVR, transfers, AI, international numbers.30%
- Value for moneyCost at 5 and 20 users, minimums, minutes, add-ons.25%
- Available integrationsCRM, help desk, Teams, Zapier or Make.20%
- Ease of useApp experience, setup without a consultant.15%
- Customer support and assistanceResponsiveness, contract terms, exit and porting.10%
The ranking is editorial: a sponsored placement is always labeled on its card, and no affiliate link changes a score.
RingCentral
RingCentral is the safe all-round choice. Its phone system (RingEX) comes in three plans, all with unlimited domestic calling and desktop and mobile apps. It has the widest feature set on this page, which is why it scores 4.5 on features.
The plan most teams need is Advanced at $25 per user a month on yearly billing: it adds the CRM integrations and multi-site management. For five users that is $125 a month; for twenty, $500, or $6,000 a year. Core at $20 covers a team that does not need the CRM link. Extra numbers cost $4.99 each.
The trade-off is the experience around the product. Unlimited calling covers the US and Canada only, and the month-to-month price is $10 higher than the yearly one on Core and Advanced. Plan for a yearly contract and read the renewal clause.
Its limit: you pay for depth you may not use, and support (3.5 in our grid) trails its features (4.5).
- Unlimited domestic calling on every plan
- CRM links and multi-site on Advanced
- Desktop, mobile and desk phone support
- ✓Widest feature set on this page
- ✓Scales from a small office to hundreds of users
- ✓Large integration catalog
- ✗Unlimited calling limited to the US and Canada
- ✗Month-to-month costs up to $10 more
- ✗Overkill for a five-person team
The default pick for a growing US company. Negotiate the term and check the renewal date before you sign.
Allo
Allo is built for the phone in your pocket. Each person gets a business number inside the app, with no second SIM and no desk phone, and can switch to the desktop app at the office. It is the most pleasant system on this page for field sales, real estate agents and technicians.
Our review sets Business at $32 per seat a month on yearly billing, $45 month to month. Five seats cost $160 a month; twenty, $640. Native integrations are among the broadest here: HubSpot, Salesforce, Attio and Pipedrive, plus Zapier and Make for the rest. If you plan to send business texts in the US, budget $24 one-off for the 10DLC registration.
Its AI receptionist answers when nobody can, asks why the person is calling and leaves a written note. Ask your sales contact what is included on your plan, as the offer has changed between price pages.
Its limit: Allo is young, with few public reviews, and its supervision tools trail RingCentral and Aircall.
- Business number inside the mobile app
- AI agent for missed calls
- Free number porting
- ✓Top score in this ranking
- ✓Month-to-month billing to start
- ✓Native CRM sync
- ✗Few public reviews
- ✗Lighter supervision for managers
- ✗10DLC fee for US texting
Pick it if your team lives on its phones. For a twenty-person office with a manager watching call stats, RingCentral or Aircall do more.
Aircall
Aircall is the reference for CRM-driven teams. When the phone rings, the caller's record opens; when the call ends, it is logged on the right contact with its length and notes. Users rate its HubSpot and Pipedrive links highly. It also handles queues with callback and routing by language.
Essentials costs $30 per license a month on yearly billing and Professional $50, with three licenses at minimum. Five users on Essentials pay $150 a month; twenty pay $600. The AI add-on is $9 per license and Analytics+ is $15: on twenty seats, both together add $480 a month.
Complaints center on slow support, a mobile app that sometimes fails, and charges after cancellation. That explains a 3.2 score despite strong features.
Its limit: add-ons push the price up fast, and support does not match the price tag.
- Caller record pops on screen
- Queue with callback
- Routing by language
- ✓Some of the best CRM integrations
- ✓Simple interface for agents
- ✓Large app marketplace
- ✗Three-license minimum
- ✗AI and analytics cost extra
- ✗Support rated slow
The right pick when your CRM runs the team. Price the add-ons before signing, not after.
CloudTalk
CloudTalk stands out on reach: numbers in 160 countries, so a customer in Mexico, Germany or the UK sees a local caller ID. For a team selling or supporting abroad, that lifts answer rates. Routing is detailed, with rules by skill and by time of day.
Plans are listed in euros: Essential at €29 per seat a month on yearly billing. Five seats cost €145 a month; twenty, €580. Expert at €49 adds advanced features and needs three seats: €980 a month for twenty. Lite at €19 suits a small team calling mostly at home.
Reviews point to decent CRM integrations and a clear interface, but support rated average. Ask for the price of each number in each country before you sign: it is not part of the per-seat price.
Its limit: value drops quickly as you stack numbers and add-ons.
- Numbers in 160 countries
- Skill-based routing
- Four plans to grow into
- ✓Strong fit for teams selling abroad
- ✓Clear interface
- ✓Detailed routing rules
- ✗Support rated average
- ✗Priced in euros
- ✗Expert needs three seats
The best pick once your customers are spread across countries. For a US-only team, RingCentral is simpler.
KrispCall
KrispCall has the lowest entry price on this page: Essential at $12 per user a month on yearly billing, $15 month to month. Five users pay $60 a month in subscription; twenty pay $240. Standard at $32 adds fuller team features.
The catch is in the word subscription: minutes are paid as you go from a balance you top up. For a team on the phone an hour a day, the minutes can cost more than the plan. Do the math: estimate monthly minutes, multiply by the vendor's rate for each destination, and compare with an unlimited plan.
The app is easy to learn and its CRM integrations score well in our review. KrispCall also offers numbers in many countries, handy for testing a new market without a big commitment.
Its limit: the bill moves every month with call volume.
- Lowest subscription in this ranking
- Usage-based minutes
- Numbers in many countries
- ✓Easy way to start small
- ✓Month-to-month billing
- ✓Quick to learn
- ✗Minutes on top of the plan
- ✗Bill changes month to month
- ✗Fewer team features on Essential
Great for a team that calls little. Past an hour of calls per person per day, an unlimited plan costs less.
3CX
3CX is not a turnkey service but PBX software: the brain of your phone system, hosted on your own server or by a partner. You then pick a carrier that provides a SIP trunk for outside calls. It is the only option here where you can change carriers without changing software.
SMB Free costs nothing for up to 10 users. With five users you only pay the carrier. At twenty you need a paid edition, billed yearly by the number of simultaneous calls rather than per user. Prices vary by reseller, so get a quote and count your IT person's time too.
The system is complete, with desktop and mobile apps, an auto attendant and support for many IP desk phones. Setup is more technical than anything else on this page, hence the low ease-of-use score.
Its limit: without technical help in-house or at a partner, the first problem can leave you stuck.
- Free for up to 10 users
- Any SIP carrier
- Licensed by simultaneous calls, not users
- ✓No license fee for a small team
- ✓You control the hosting
- ✓Works with many desk phones
- ✗Technical setup
- ✗SIP trunk and hosting to plan
- ✗Paid edition prices on request
Worth it if someone can already set it up. Otherwise a hosted system costs you less time.
What really separates two VoIP phone systems
On paper, every system here makes calls over the internet. In practice, the right choice comes down to four checks.
The bill for 5 and for 20 users
Monthly, on yearly billing. Five users: 3CX $0 in licenses plus the carrier, KrispCall Essential $60 plus minutes, CloudTalk Essential €145, Aircall Essentials $150, Allo Business $160, RingCentral Advanced $125. Twenty users: KrispCall $240 plus minutes, RingCentral $500, CloudTalk €580, Aircall $600, Allo $640, 3CX a yearly license to quote. Then add extra numbers, AI add-ons and international minutes.
Apps before features
Your team will spend its day in the app, not in the feature list. Have two people run the trial on their own phone and laptop for a week. The most common complaints, whatever the vendor, are about mobile apps: missed notifications, phones that do not ring, crashes.
Business texting and 10DLC
Sending texts from a US business number requires a 10DLC registration with a fee. Allo charges $24 one-off; Quo charges $19.50 one-off plus a monthly fee. Count it in your first-month budget if texting matters to your customers.
When Teams Phone or Zoom Phone is enough
If the whole company already works in Teams or Zoom, their phone add-on saves one more app. Zoom Phone lists a global plan at $20 a user with unlimited domestic calling in more than 40 countries; some users say Zoom pushes its whole bundle once you buy the phone. Teams Phone needs a calling plan or an operator partner on top. Both stay lighter on CRM links.
- Count users and peak simultaneous calls.
- Check upload speed: about 90 kbps per call each way.
- Have two people use the mobile app for a week.
- List the countries you call and the numbers you need.
- Get the term, renewal and porting terms in writing.
- Confirm every call logs an activity in your CRM.
Switching to VoIP without dropped calls
Most audio problems come from the network, not the software. These steps avoid the mistakes teams mention most after switching.
Work out the bandwidth you need
NetworkA standard-quality call (G.711 codec) uses about 87 kbps each way on Ethernet; a compressed codec such as G.729 drops to about 31 kbps. Multiply by your simultaneous calls: twenty people on the phone at once need roughly 1.75 Mbps up and the same down.
Any business fiber line handles that. The real risk is sharing: a backup or a video call saturating upload at the same moment.
- One G.711 call
- About 87 kbps each way
Prioritize voice on your router
NetworkMost business routers can send voice ahead of other traffic (QoS). Ask your IT provider to turn it on. It fixes the most reported problem: choppy audio when several people are on calls at once.
- Symptom
- Choppy audio at peak hours
Pick the right hardware for each seat
EquipmentA good wired or USB headset does more for call quality than switching software. Keep IP desk phones for the front desk, and check they are on the vendor's compatibility list before buying. On Wi-Fi, prefer the 5 GHz band close to the access point.
- Priority
- Headset before desk phone
Port your numbers before cancelling anything
PortingAsk the new provider to run the port and keep your old service active until it completes. Make sure the account name and address you give match the old carrier's records exactly. Cancelling first can cost you the number.
- Rule
- Cancel after the port, never before
Connect the CRM during the trial
IntegrationHook up your CRM while you are still on trial. Make ten calls and check: does each call create an activity on the right record? Does an unknown number create a contact without duplicates? This is where systems differ most.
- Check
- Duplicate contacts
Lock down international calling
SecurityTurn on two-factor sign-in, restrict international calling to the people who need it, and watch the first bills for unusual destinations. A hijacked account calling premium numbers abroad can run up a large bill over one weekend, and the business pays it, not the carrier.
- First step
- Two-factor sign-in
Other pages for your situation
Each page covers a different case.
Cost at 10 and 50 seats.
You have fewer than ten peopleVirtual phone system for small businessCost at 1, 3 and 5 people.
You run a real agent floorCall center softwareHigh inbound and outbound volume.
You are torn between two toolsAircall vs CloudTalkHead to head.
You want to leave AircallAircall alternativesYour options.
You want a full reviewKrispCall reviewPricing, minutes, limits.
VoIP phone systems · FAQ
What is a VoIP phone system?
It is software that carries your business calls over the internet instead of a traditional phone line. You call from a desktop app, a mobile app or an IP desk phone. Numbers belong to your account, not to a desk, so a remote employee answers the same number as the front desk.Is there a free VoIP phone system for business?
Yes, with conditions. 3CX offers a free edition for up to 10 users, as long as you host it and pay a carrier for the SIP trunk. Hosted systems such as RingCentral, Aircall or Allo are all paid. KrispCall has the lowest subscription at $12 a user on yearly billing, but charges minutes separately.How much internet speed does VoIP need?
Plan for about 90 kbps per call in each direction at standard quality. Ten simultaneous calls need under 1 Mbps upload, which any fiber line provides. Stability matters more than speed: busy Wi-Fi or a large upload at the same moment causes dropouts. Turn on voice priority on your router.Can I keep a desk phone with a VoIP system?
Yes, as long as it is a compatible IP phone. Most systems in this ranking accept desk phones alongside their apps. An old analog handset needs an adapter, and not every provider supports one. Check the vendor's list of supported models before you buy hardware.Does VoIP work with Microsoft Teams?
Yes, in two ways. You can use Teams Phone, Microsoft's own calling add-on, with a calling plan or an operator partner. Or you keep a third-party VoIP system that integrates with Teams. The first saves an app; the second keeps the CRM links and call stats of a dedicated system.How long does switching to VoIP take?
A few hours to create accounts and install apps, then usually several days to port existing numbers. The slowest part is often gathering the exact account details your old carrier has on file. Keep the old service running until the port completes: never cancel it yourself first.Should I pay monthly or yearly?
Start monthly if the vendor allows it, then switch to yearly once the team has adopted the tool. Yearly is cheaper, $10 less per user on RingCentral Core and Advanced, but it locks you in for twelve months and often renews automatically. Allo and KrispCall show monthly prices; Aircall and CloudTalk lead with yearly.Is RingCentral or Quo better for a small team?
For one to five people in the US, Quo is simpler and cheaper, from $15 a user yearly, but its IVR only starts on the Business plan at $23. RingCentral costs more but scales further and includes unlimited domestic calling on every plan. Pick Quo for a small office, RingCentral if you expect to grow past twenty users.
