VoIP for Small Business: A Practical Guide

VoIP for small business is no longer the risky option. For most teams it’s simply how business phones work now. But “it runs over the internet” leaves practical questions: is your connection good enough, do you need to buy phones, what will the bill really look like, how does 911 work, and what happens when the internet goes down? This guide answers those questions so you can switch with confidence.

If you already know you want VoIP and just need to choose a provider, go to our roundup of the best business phone systems for small business. This article is about understanding VoIP and getting ready for it. We make Tocaller, a browser-based phone system, and we mention it where it’s relevant, including where it’s not the right fit.

What VoIP for small business actually means

VoIP (Voice over Internet Protocol) turns your voice into data and sends it over an internet connection instead of a copper phone line. For a small business, that usually means a cloud phone system: the provider runs the phone system in its data centers, and your team connects to it.

Your team can connect in a few ways:

• In a browser. Calls are made and answered in a browser tab with a headset. Nothing to install.
• In an app on a computer or mobile phone, sometimes called a softphone.
• On an IP desk phone, a handset that plugs into your network instead of a phone jack.
• Through an adapter (ATA) that lets an older analog phone or fax machine connect to a VoIP service, if your provider supports it.

Because the system lives with the provider, the things that used to need a technician become settings: business hours, menus, who rings when, voicemail and call recording. Adding a new hire is a settings change, and people can take calls from the office, home or the road using the same business number.

When VoIP is the right call, and when it isn’t

VoIP fits well if your team works on computers, some people work remotely, you want to change call routing yourself, or you’re adding people often. It’s a weaker fit if your location has unreliable internet with no backup, or if the line also carries equipment that expects a traditional phone line, such as an older alarm panel, fax machine or card terminal. Check those devices before you cancel anything.

Is your internet ready for VoIP?

Voice calls don’t need much bandwidth, but they need a steady connection. A short check before you switch saves a lot of frustration.

How much bandwidth a call uses

AT&T Business’s guide to VoIP bandwidth requirements suggests about 100 kbps per call, in each direction, as a useful starting point, with a common planning range of 80 to 100 kbps per active call. It depends on the codec, the method used to compress the audio:

To size your connection, multiply the number of calls that happen at the same time (not your total number of users) by 100 kbps. AT&T’s example: ten active calls use roughly 1 Mbps in each direction. Five people on calls at once would need about 500 kbps up and 500 kbps down. That’s small next to most business broadband plans, but remember that video meetings, cloud backups and file uploads share the same connection, so leave room for them.

A five-minute readiness check

1. Count your busiest moment. How many people are on the phone at the same time on a busy morning? Use that number, plus a margin, for your bandwidth math.
2. Check upload speed, not just download. Calls send audio both ways, and on many internet plans upload is slower than download.
3. Test from a wired computer. AT&T recommends running tests from a wired device to take Wi-Fi out of the picture. If wired results are fine but calls are poor on Wi-Fi, the problem is your wireless setup, not your internet plan.
4. Look beyond speed. Latency (delay), jitter (uneven delay) and packet loss affect call quality more than raw speed. AT&T notes that even small packet loss can cause missing words or robotic audio.
5. Make one real test call per location during a busy part of the day, ideally on a free trial, before you move your main number.

If several people share an office connection that’s also busy with video and uploads, ask whoever manages your router about prioritizing voice traffic (often called QoS).

Hardware: headset, desk phone or nothing at all?

You may not need to buy any phones. Many small teams run VoIP entirely on laptops and mobile phones.

A headset (the usual choice)

For browser and app calling, a decent headset with a microphone makes the biggest difference to how you sound. A wired USB headset avoids battery and pairing problems. Bluetooth gives you freedom to move but adds another thing that can drop. For noisy rooms, pick one with a noise-cancelling microphone. Laptop speakers and built-in microphones work in a pinch, but callers will hear the room.

Desk phones

Some people, often at a front desk or reception, prefer a physical handset. IP desk phones only work if your provider supports them, so check before you buy one. Among the providers we reviewed, Vonage lists VoIP desk phones on its Premium plan, and RingCentral offers phone rental with a multi-year contract.

Adapters for older equipment

If you have an analog phone, fax machine or other device you want to keep, ask the provider whether it supports an analog telephone adapter (ATA) before you rely on one.

Where Tocaller fits: Tocaller runs in desktop and mobile browsers with a headset. There’s no hardware to buy, but it also doesn’t support desk phones or SIP devices. If handsets are a must, choose a provider that supports them.

VoIP fees that aren’t in the headline price

VoIP is usually cheaper than a stack of landlines, but the per-user price on a pricing page is rarely the whole bill. Here are the charges to look for, with real examples from official pricing pages.

Texting registration exists because of the industry’s 10DLC system for business texts. The Campaign Registry, which runs it, says businesses can’t register directly and must go through a registered messaging provider. That’s why the fee shows up on your phone provider’s bill.

On Tocaller, phone numbers and calls are paid from a prepaid workspace balance, and the app shows the price before you use a separately billed service. You add funds to your balance when you need to, so there’s no surprise usage invoice. The trade-off is that nothing is “included”: if you want calling bundled into a flat per-user price, a plan with included US and Canada calling will suit you better. To see how these fees add up on an example bill, read our guide to cheap business phone systems and what you give up.

Emergency calling (911) on VoIP

This is the part of VoIP most people skip, and the one that matters most on a bad day. What follows is general guidance, not legal advice. Ask each provider on your shortlist exactly how emergency calls work on its service.

Why VoIP 911 is different

A landline is tied to one address. A VoIP number isn’t, because it can be used from any connection. The FCC’s guide to VoIP and 911 service explains that interconnected VoIP providers must meet enhanced 911 (E911) obligations, including getting a customer’s physical location before service is activated and providing easy ways to update it. It also warns that a VoIP 911 call may not send your location automatically.

Kari’s Law and RAY BAUM’S Act

Two federal laws shape 911 on business phone systems with multiple lines. The FCC’s page on 911 requirements for multi-line telephone systems covers both:

• Kari’s Law requires that anyone can dial 911 directly, without a prefix or access code such as 9, and that the system notifies a central location (such as a front desk or security office) when 911 is called. The rules took effect on February 16, 2020.
• RAY BAUM’S Act is about location. It requires that 911 calls carry a “dispatchable location”, meaning the street address plus details such as a floor or suite, so responders can find the caller quickly.

What to do as a small business

• Ask each provider how 911 works, which address it sends and how you update it.
• Register an accurate address for each office, including suite or floor.
• Update the address when someone moves desks, offices or starts working from home.
• Tell your team that 911 from a VoIP line may behave differently from a mobile phone, and keep a mobile phone available as a backup, especially during outages.

Switching from a landline without losing calls

You can usually keep your existing number. The FCC’s guide to porting your phone number says you can keep your number when you change providers in the same area, that porting works between wireline, IP and wireless providers, and that your old company can’t refuse to port your number even if you owe it money. Simple ports are processed in one business day.

A switch that doesn’t drop calls usually goes like this:

1. Check your current contract for early termination terms and any equipment you rent.
2. List everything on the old line: numbers, fax, alarm panels and card terminals. Decide what moves and what needs a replacement.
3. Confirm the new provider can port your numbers before you sign up. Not every provider does.
4. Set up and test on the new system first. Build your routing, invite the team and make test calls on a temporary number.
5. Submit the port with the account details from your current carrier. Have a recent bill handy so the details match.
6. Keep the old service active until the port completes. Cancelling first can put the number at risk.
7. Update your 911 address on the new service and check that calls ring where you expect.

Number porting isn’t part of Tocaller’s published features today, so ask us first if you need it. If keeping your current number matters, choose a provider that supports porting. Quo includes a new or ported number per user, and CloudTalk and Allo list porting on their pricing pages. If you’re starting fresh, you can buy a new number in Tocaller; the number types available depend on the country. Startups weighing this decision can read our business phone system for startups guide on keeping numbers when you switch.

What happens when the internet goes down

If your office internet or power goes out, anything that relies on that connection stops working there: browser calls, apps on office Wi-Fi and desk phones on your network. That’s the real trade-off of VoIP, and it’s manageable.

The good news is that a cloud phone system doesn’t live in your office. The routing runs at the provider, so incoming calls still arrive and follow your rules. They can ring people who are somewhere else or go to voicemail instead of ringing out. Some practical ways to prepare:

• Build a fallback into your call flow. Make sure unanswered calls go to voicemail or to another group. In Tocaller, you set this up in your call flow with ring groups and a voicemail step.
• Use mobile data as a backup. If your provider works on mobile, someone can keep answering from a phone. Tocaller works in mobile browsers, so a teammate can open it on a phone and keep taking calls over mobile data.
• Keep the router up. A small battery backup (UPS) for your modem and router can carry you through short power cuts.
• Consider a second connection if phones are critical to your business, such as a backup line from a different internet provider or a mobile hotspot.
• Plan for 911. During an outage, use a mobile phone for emergencies.

VoIP providers worth a look

Here’s a short list grouped by VoIP fit. For the full roundup with reviews, seat minimums and setup steps, see the best business phone systems for small business.

Tocaller is a good fit for a team of three or more that works on computers and wants to manage routing itself without hardware. It’s not the best fit if you’re on your own, need desk phones, want to keep an existing number, or want calling included in a flat price.

FAQ

Ready to try VoIP without buying hardware?

If your internet passes the check above and your team works on computers, you can try Tocaller in the browser today. The trial lasts 7 days, and nobody is charged automatically when it ends.

Start your 7-day free trial or see pricing.