--- title: "What Is VoIP? A Plain-English Business Guide | Chargezen" description: "What VoIP is, how it differs from a landline or cell plan, the kinds of VoIP service, the 911 limits to know, and how to tell if your business should switch." url: "https://chargezen.com/blog/what-is-voip" lang: "en" updated: "2026-10-18" --- Canonical URL: https://chargezen.com/blog/what-is-voip # What Is VoIP? A Plain-English Guide for Small Businesses DTC Strategy · 8 min read ![Jerry Abrahamson](https://chargezen.com/assets/blogpost1.6581a30d.png) Jerry Abrahamson Founder & CEO • Oct 18, 2026 ![What Is VoIP? A Plain-English Guide for Small Businesses](https://chargezen.com/og-default.png) VoIP (voice over internet protocol) is a phone call carried over the internet instead of a copper phone line. If you've used a calling app on a laptop, a desk phone that plugs into a network jack, or a business phone service you pay for per user, you've used VoIP. Most business phone systems sold today are VoIP systems. This guide explains what VoIP is in plain words, how it differs from a landline and a cell plan, the kinds of VoIP service you'll see in quotes, what can go wrong (including 911), and how to decide whether it fits your business. If you want the technical version, read [how VoIP works, step by step](https://chargezen.com/blog/how-does-voip-work). ## VoIP in one paragraph Your voice is turned into small packets of data, sent over an internet connection and turned back into sound on the other end. A VoIP provider connects those packets to the regular phone network, so you can still call and be called by any ordinary phone number. The FCC calls this "interconnected VoIP": a service that enables real-time, two-way voice, needs a broadband connection and internet-compatible equipment, and lets users receive calls from and place calls to the public switched telephone network ([47 CFR § 9.3](https://www.law.cornell.edu/cfr/text/47/9.3), checked October 19, 2026). That last part, the public network, is explained in our [guide to the PSTN](https://chargezen.com/blog/pstn). ## VoIP vs a landline vs a cell plan | | Landline (POTS) | Cell plan | VoIP | | --- | --- | --- | --- | | What carries the call | A copper pair from the phone company | Your carrier's cell towers | Any internet connection | | Where you can answer | Phones wired to that line | One phone (per number) | Desk phones, computers, phone apps, browsers | | Sharing one number | Extra handsets on the same line | Hard; one SIM, one person | Built in: many people, one number | | Works in a power cut | Often, if the line is copper and the phone is corded | Yes, while the battery lasts | Only with backup power for the modem, router and phones | | Typical pricing | Per line from the local carrier | Per phone plan | Per user or per number, per month | | Future | Being retired by large carriers | Stable | Where most business phone service is going | General comparison. Specific features and prices vary by provider and plan. If you still pay for copper lines, our guide to [POTS lines and copper retirement](https://chargezen.com/blog/pots-lines) covers what's changing and what to move first. ## The kinds of VoIP you will run into * **Cloud phone systems (hosted PBX)**: A provider runs the phone system in its data centers and you pay per user. You get extensions, voicemail, a phone menu and ring groups, managed from a web page. RingCentral, Zoom Phone, Dialpad and Ooma Office are examples. Our [hosted PBX guide](https://chargezen.com/blog/hosted-pbx) explains what you get. * **Virtual phone numbers**: A business number that rings the phones you already have, usually through an app. Lighter than a full phone system; Google Voice, Quo and Grasshopper sit here. * **SIP trunking**: If you own a phone system (a PBX in a closet), a SIP trunk replaces the copper lines that connect it to the outside world. The system stays; only the connection changes. * **Softphones**: A calling app on a computer or phone that acts as your desk phone. See [what a softphone is](https://chargezen.com/blog/what-is-a-softphone). * **Consumer calling apps**: WhatsApp, FaceTime Audio and similar apps use VoIP too, but they call other app users. They don't give you a business number that any phone can dial. You may also see "fixed" and "non-fixed" VoIP. A fixed VoIP number is tied to a registered street address, like a landline. A non-fixed number can be set up online with no physical address. Some banks and services won't accept non-fixed numbers for verification, and spam filters can treat them with more suspicion, so a business number from a provider that verifies your business is the safer choice. ## What you need to use VoIP * A steady internet connection. Each call needs well under 100 kbps each way with common settings, but it needs it steadily (see [how VoIP works](https://chargezen.com/blog/how-does-voip-work) for the numbers). * Something to talk on: a computer with a headset, a phone app, or a desk phone made for VoIP (an "IP phone"). * A provider account, which gives you a phone number and connects your calls to the public network. * For an old analog phone or fax machine, an adapter (an ATA) that plugs the old device into your network. ## Why businesses switch to VoIP * **Answer from anywhere**: The same number rings at the office, on your phone and on a laptop at home. * **Share a number**: Several people can answer one main number, see the call history and pick up where a teammate left off. * **Change it in software**: Adding a person or a number takes minutes in an admin page instead of a technician visit. * **Connect it to other tools**: Calls can show up next to the customer record in your help desk or CRM, be recorded and transcribed, or be answered by an AI agent. * **Predictable pricing**: Most plans include unlimited US calling for a flat per-user price. Our [VoIP cost guide](https://chargezen.com/blog/voip-cost) lists the extra fees to watch. ## The downsides, honestly * **It needs internet and power**: If the internet or the power goes out, your VoIP phones stop working unless your modem, router and phones are on battery backup or calls can fall back to a cell app. * **Call quality depends on your network**: Choppy audio, delay and dropped calls usually come from a busy or unstable connection, especially on crowded Wi-Fi. * **911 works differently**: A VoIP phone doesn't automatically know where it is. More on this below. * **Old devices need adapters**: Alarm panels, fax machines, elevator phones and card terminals built for copper lines may not work reliably over VoIP. Test them before you cancel a line. ## VoIP and 911: what to know Interconnected VoIP providers must give you 911 service, and they must collect the "registered location" where you'll use the service before it starts and give you a way to update it. They also have to tell every subscriber, plainly, when 911 may not work or may work differently than on a landline. The FCC's list includes moving your equipment, using a number that isn't native to your area, an internet outage, a power cut, and delays in getting your address to the 911 center ([47 CFR § 9.11](https://www.law.cornell.edu/cfr/text/47/9.11), checked October 19, 2026). In practice: set the right street address, suite or floor for every phone or user when you sign up, update it when anyone moves (including remote staff), and post a note by shared phones about what to do in an outage. This is general information, not legal advice; check your provider's 911 terms. ## Does your business need VoIP? A quick way to decide. VoIP is probably right if two or more of these are true: * More than one person needs to answer or call from the business number. * People work from more than one place: the office, home, the road. * You want calls recorded, transcribed or shown next to customer records. * Your carrier has sent a notice about retiring copper lines. * You want to add or remove people without a technician. A cell phone with a second number can be enough for a one-person business. A full cloud phone system makes sense when you have an office with people at desks who answer all day. In between, many small teams want something simpler: every call answered, and the right person pulled in when it matters. Our guide to [getting a business phone number](https://chargezen.com/blog/get-business-phone-number) walks through the choices. ## How Chargezen helps Chargezen runs on the same kind of internet calling, but it isn't a phone system you staff. Concierge answers the calls and texts on your business number with AI, and your team joins or takes over when a customer needs a person. * **One US number for calls and texts**: Get a toll-free or local US number in Chargezen, search open numbers by area code on [phone numbers](https://chargezen.com/phone-numbers), or [bring the number you already have](https://chargezen.com/concierge/features/bring-your-number). Chargezen files the carrier registration texting needs. See [a business phone number](https://chargezen.com/concierge/features/business-phone-number). * **Concierge answers every call and text**: Day and night, with the opening line you write, answering from the information you give it. It recognizes returning callers by their number. See the [AI receptionist](https://chargezen.com/concierge/use-cases/ai-receptionist) and the [phone channel](https://chargezen.com/concierge/channels/phone). * **Teammates join from Finn or the browser**: When a customer needs a person, Concierge alerts your team in the Finn app and the browser, and emails or texts the teammates you pick. Listen in with your microphone off, tap Join the call, and Concierge tells the caller you're there. From the Finn app on iPhone or Mac you can transfer the call to a teammate, with a note. See [phone calls](https://chargezen.com/concierge/features/phone-calls). * **One thread per customer**: Calls, texts and the rest of the customer's history sit together in the [team inbox](https://chargezen.com/smartytap/team-inbox), so whoever picks up next can see what was said. * **Recording by your rules**: Set each number to always record or never record. Callers hear your notice before recording starts, and you choose how long recordings are kept. See [call recording](https://chargezen.com/concierge/features/call-recording). To be plain about what Chargezen is not: it doesn't sell VoIP lines, desk phones or a PBX. It has no extensions, phone menu, ring groups, call forwarding, simultaneous ring or business-hours routing, and it offers US (+1) numbers only. If you need those, buy a phone system built for them. Chargezen answers the calls and texts on your business number, and your team works the same conversations from there. Concierge Starter is $20 a month with 20,000 credits. Pro is $199 a month with 199,000 credits, or $1,990 a year. Phone and text charges are billed as used, with no per-user fees. See [pricing](https://chargezen.com/pricing). Related terms: [VoIP](https://chargezen.com/glossary/voip-voice-over-internet-protocol), [number porting](https://chargezen.com/glossary/number-porting), [STIR/SHAKEN](https://chargezen.com/glossary/stir-shaken) and [AI receptionist](https://chargezen.com/glossary/ai-receptionist). Related guides: [how VoIP works](https://chargezen.com/blog/how-does-voip-work), [how much VoIP costs](https://chargezen.com/blog/voip-cost) and [hosted PBX explained](https://chargezen.com/blog/hosted-pbx). ## Frequently asked questions ## Is VoIP the same as Wi-Fi calling? Not quite. Wi-Fi calling is a feature of your cell plan: your carrier routes your normal mobile number over Wi-Fi when the signal is weak. VoIP is a separate service with its own number and account, usually priced per user. ## Can I keep my current number if I switch to VoIP? Usually, yes. Most US numbers can be ported to a VoIP provider. Keep the old service active until the move is done. Our [porting guide](https://chargezen.com/blog/how-to-port-a-phone-number) covers the steps. ## Is VoIP secure? It can be. Ask whether the provider encrypts calls (look for TLS and SRTP), turn on two-factor sign-in for the admin account, and limit who can make international calls, since account takeovers are often used to run up toll charges. ## Does VoIP work with a cell phone? Yes. Nearly every provider has an iPhone and Android app that rings with your business number, so you can answer and call out without showing your personal number. ![Jerry Abrahamson](https://chargezen.com/assets/blogpost2.32f70dbd.png) Written by ### Jerry Abrahamson Jerry is the Founder and CEO of Chargezen, helping brands build sustainable omni-channel businesses. With over 10 years of experience in omni-channel commerce and SaaS, he's passionate about helping brands create recurring revenue streams. [](https://twitter.com/chargezenjerry)[](https://linkedin.com/in/jerry-a) ## Related Articles [ ![How Does VoIP Work? 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