What Counts as VoIP?
Anything that turns speech into data packets and sends them over an IP network counts as VoIP, whether it's a free messaging app or a full company phone system. The differences are in who you can reach and what comes with it.
It helps to split VoIP examples into two groups:
- App-to-app VoIP: Calls between users of the same app, such as WhatsApp or FaceTime. Usually free, but you can only reach people who have the app, and you don't get a regular phone number.
- Interconnected VoIP: Services that connect to the ordinary phone network, so you can call and be called by any landline or mobile. Business phone systems and many home phone services work this way.
For how the technology works underneath, see what VoIP is and how it works.
Personal VoIP Examples
Most people use VoIP every day without choosing it. These are the examples you're most likely to meet at home.
Messaging app calls WhatsApp, FaceTime, Signal, Viber, Telegram, and Messenger calls are all VoIP. They're free between users over Wi-Fi or mobile data, which is why they're so popular for calling family abroad.
Video calls with friends and family Group video calls on any app carry their audio over VoIP, alongside the video stream.
Wi-Fi calling on your mobile When your phone shows "Wi-Fi Call", your carrier is routing an ordinary call over your internet connection instead of the cell tower. It uses your normal number and plan.
4G and 5G voice calls Modern mobile networks carry voice calls as IP data too, using a technology called VoLTE (and its 5G equivalent). Your "normal" mobile calls are increasingly VoIP under the hood.
Home phone service Many home phone packages from cable and fibre companies plug an ordinary handset into the router. The line looks traditional, but the calls travel as VoIP.
Online gaming voice chat Multiplayer games and gaming platforms use built-in voice chat so teammates can talk while they play.
Smart speakers and video doorbells Calling from a smart speaker or talking to a visitor through a video doorbell uses the same idea: voice sent as data over your home network.
A second number on your phone Apps that add a separate number to your existing phone, for online selling, dating, or privacy, use VoIP to ring the app. A personal phone number keeps your main number private.
Business VoIP Examples
In business, VoIP has replaced most traditional phone lines. These are the uses you'll find in offices, shops, and remote teams.
Business phone system The company's numbers ring on desk phones, laptops, and mobile apps at the same time, with menus, voicemail, and call transfer. A business phone system built on VoIP is now the default for small and mid-sized businesses.
A business number on your own mobile Staff install an app and take work calls on the business number without handing out their personal numbers. When someone leaves, the number stays with the company.
Call centres Agents handle inbound and outbound calls in software, with queues, dialers, live monitoring, and reporting. Most call centre software is VoIP-based.
Auto attendants and IVR menus "Press 1 for sales, 2 for support" menus that route callers without a receptionist run on VoIP. See IVR for how they work.
Video meetings and dial-in conferences Every online meeting platform carries its audio over VoIP, whether people join from a browser, an app, or by dialling in.
Calling from a computer or browser A softphone or browser dialler lets staff make calls from a computer with a headset.
Local numbers in other countries A business in one country answers calls from customers in another on a local number. Virtual phone numbers are VoIP numbers that ring wherever the team is.
SIP trunks for an existing phone system A business keeps its office PBX but replaces the old phone lines with virtual lines over the internet.
AI voice agents and call summaries Software that answers routine calls, or writes up a summary after each call, works on the audio that VoIP already carries as data.
VoIP Examples by Industry
Every sector uses VoIP a little differently. These are typical examples.
- Healthcare: Clinics route appointment calls through menus, send reminders by text, and run telehealth calls over the internet.
- Retail and restaurants: One number rings every till or branch, and after-hours calls go to voicemail or an online booking link.
- Real estate: Agents take calls on the business number from their mobiles while out at viewings.
- Legal and financial services: Calls are recorded where rules allow, and caller details pop up from the case or client system.
- Education: Schools use IP phones in classrooms and IP paging for announcements.
- Hospitality: Hotels connect room phones to the front desk and outside lines over the same network as their Wi-Fi.
- Remote and hybrid teams: One company number and directory, wherever staff sit, supported by VoIP for remote work.
VoIP Examples in Buildings and Devices
VoIP isn't only in phones and apps. It's increasingly built into the equipment around you, especially as copper phone lines are retired.
Paging and intercom systems Hospitals, schools, warehouses, and offices send announcements through IP speakers on the same network as their phones.
Door entry systems Apartment and office intercoms that ring a mobile app or a desk phone when a visitor presses the button.
Lift and emergency phones Emergency phones in lifts, car parks, and campuses are moving from dedicated copper lines to IP or cellular connections.
Alarm panels and monitoring Many security and fire alarm panels now report over IP or cellular links instead of a phone line. Check each one with its installer before a copper line is switched off.
Which Type of VoIP Is Each Example?
Every example above falls into one of four types. Knowing which one you're using explains what it can and can't do.
Example | Type of VoIP | Can call any phone number? | Gives you a phone number? |
| WhatsApp, FaceTime, Signal calls | App-to-app | No, only app users | No |
| Wi-Fi calling, 4G/5G voice | Carrier IP calling | Yes | Yes, your mobile number |
| Home phone from a cable or fibre company | Interconnected VoIP | Yes | Yes |
| Business phone system, mobile business app | Hosted (cloud) VoIP | Yes | Yes, local, toll-free, or international |
| Office PBX with SIP trunks | On-premise or hybrid VoIP | Yes | Yes |
| Video meeting audio | App-based (dial-in optional) | Only through dial-in | Usually not |
| Game voice chat, smart speakers | App-to-app | No, only app users | No |
Why VoIP Is Everywhere Now
VoIP has been around since the mid-1990s, but three changes turned it from a niche into the default way voice travels.
Broadband and mobile data Always-on connections made call quality dependable, at home, in the office, and on the move.
Smartphones Every smartphone can run a calling app, so a VoIP phone is already in almost every pocket.
The end of copper Telephone companies are retiring their old copper networks. The UK's analogue network is scheduled to close on 31 January 2027, and US carriers are retiring copper with the FCC's approval, so services that once used phone lines are moving to IP.
The result is that many "traditional" services, from home phone lines to lift phones, now run over VoIP without most people noticing.
Personal or Business VoIP: Which Do You Need?
For personal calls to people who use the same app, free messaging apps are hard to beat. They fall short when you need to call landlines or businesses, when you want a number people can dial, or when the number represents your work.
Business VoIP makes sense once any of these apply:
- You need a number customers can call: A local, toll-free, or international number that rings your team, not a personal handle.
- More than one person answers: Ring groups, transfers, and shared numbers keep calls from being missed.
- You need records: Call logs, recordings, and CRM integration for follow-ups and compliance.
- You want to keep work separate: A business number on your own phone keeps your personal number private.
The VoIP advantages and disadvantages guide helps you weigh it up, and how much VoIP costs shows typical prices.
Next step
Find the Right Kind of VoIP
VoIP is already part of your day, from the calls on your phone to the meetings on your laptop. The real choice is which kind fits the job: free apps for personal calls, and a business phone service when customers need a number to call and a team to answer it.
If you'd like to try business VoIP, every Calilio plan includes a free US, Canada, or UK local number and a monthly bundle of free minutes and SMS.
Frequently Asked Questions
Short answers to the questions people ask most about VoIP examples.
What is the most common example of VoIP?
Messaging app calls, such as WhatsApp and FaceTime, are the most common VoIP most people use. In business, the most common example is a cloud phone system that rings on apps and desk phones.
Is WhatsApp a VoIP?
Yes. WhatsApp voice and video calls travel as data over the internet, which makes them VoIP. They're free between WhatsApp users but can't call ordinary landlines.
Is Wi-Fi calling the same as VoIP?
Wi-Fi calling uses the same idea: your carrier sends the call as data over your internet connection. The difference is that it uses your normal mobile number and plan, rather than a separate app.
Are regular mobile calls VoIP?
Increasingly, yes. 4G and 5G networks carry voice calls as IP data using VoLTE and its 5G equivalent, although to you they look like ordinary calls.
What are examples of VoIP devices?
IP desk phones, conference phones, softphone apps on computers and mobiles, headsets, analogue telephone adapters (ATAs), IP intercoms, and IP paging speakers are all VoIP devices. See what a VoIP phone is for the main types.
Is Zoom or a video meeting app VoIP?
Yes. Video meeting apps carry their audio as data over the internet, which is VoIP, and many also let people dial in from an ordinary phone.
Is a cable company home phone VoIP?
Usually, yes. Many home phone services from cable and fibre companies run over the same connection as your internet, even though you plug in an ordinary handset.
Can VoIP call regular phone numbers?
Interconnected VoIP can. Business phone systems and home phone services connect to the ordinary phone network, so they can call any landline or mobile. App-to-app services usually only reach other users of the same app.