How to set up VoIP phone systems + troubleshooting guide

If you want a phone system that’s flexible, easy- to- use, and helps you provide the best customer service, a Voice over Internet Protocol system is it. 

In this step-by-step guide, you’ll learn about the four things you need before setting up VoIP business phone systems. You’ll also learn how to go about VoIP installation, and some best practices to have the best experience. Plus, there’s a troubleshooting guide you can refer to in the future if anything goes wrong.

What is VoIP, and how does it work?

VoIP is the technology that lets you make calls and send texts over the internet instead of through traditional phone lines. 

If you’ve ever used FaceTime, WhatsApp, or Zoom to talk to someone, you’ve already used VoIP. 

The main difference with business VoIP is that you get a dedicated number and professional calling features, all running on the same internet connection you already use every day.

What’s the difference between VoIP phone systems and analog phones?

Analog phones send calls through the Public Switched Telephone Network, also known as PSTN, using copper wires or fiber optics, while VoIP systems send calls over the internet.

Practically, this means VoIP works anywhere you have an internet connection, while analog phones keep you tied to a physical line. 

Use a physical desk phone or take your calls on the go using the phone app on your smart devices. VoIP gives you the flexibility growing businesses need to stay connected from anywhere and adapt as their team or customer base grows.

Plus, VoIP is easier to set up and usually provides more advanced features than analog phones, like texting automations and integrations with other software.

Feature	VoIP	Traditional PBX
Mobility	Works anywhere with internet	Tied to a physical location
Cost	Predictable, monthly subscription-based pricing	High setup and maintenance costs
Scalability	Add new users, numbers, and features in minutes	Requires buying extra hardware and hiring expert support
Text messaging	Supports SMS and MMS, plus texting automations	No texting support, only voice calls
Security	Built-in encryption and controls from trusted providers	Secure if properly maintained — but it’s all on you
Call quality	Clear with a strong internet connection	Clear with good wiring, but weather and wiring can affect quality
Team productivity	Built for collaboration	Internal calls and call routing only

📚 Learn more: VoIP vs PBX: A complete comparison

What are the benefits of setting up VoIP?

Change is never easy. But if your business phone system doesn’t feel right, it probably isn’t. Here are some VoIP advantages that make switching worthwhile:

• Flexibility: Make and receive calls from anywhere and on any device with an internet connection. For example, you can call from your PC.
• Scalability: Add new users, numbers, and features in minutes without paying for hardware upgrades or the extra wait.
• Cost-effective: Keep upfront expenses low and pay a predictable monthly rate instead of paying for expensive on-site equipment.
• Advanced business features: Access built-in tools like texting automations, call recording and analytics, voicemail-to-email, AI features, call routing, and integrations with your other business software.
• Easy setup: Most providers only require downloading an app and logging in. Your provider takes care of all the backend tasks, like VoIP servers and technical infrastructure, for you.
• Remote work-friendly: Since team members can make and receive calls from anywhere, you can still communicate with customers on the go.

4 things you need before you set up VoIP

Setting up a VoIP phone system is pretty straightforward. There are just a few prerequisites:

1. A steady internet connection

Since VoIP runs over the internet, you need a reliable connection for clear, uninterrupted calls. 

You can use WiFi, wired internet, cellular data, or even a hotspot. But plugging your computer or desk phone into an Ethernet cable will give you the most stable connection. Wired internet is faster, more reliable, and less affected by other devices on the network.

As for the speed requirements, chances are you already meet the threshold.

The FCC requires internet speeds that have less than 0.5 Mbps download speed. That’s about the same as streaming music, and 10 to 40 times less than streaming Standard Definition video. You also need 100 Kbps of bandwidth per concurrent call. 

2. A reliable VoIP provider

The provider you choose has a big impact on call quality, available features, and the support you’ll get. They’ll also guide you through porting your number or getting a new one.

To choose the best VoIP app, look for:

• Strong uptime: Look for a provider that guarantees 99.9% uptime, so your business stays reachable around the clock.
• Easy scalability: You should be able to add users, features, or numbers in just a few clicks.
• Transparent pricing: Read third-party reviews and browse user forums to check if people report hidden fees or unexpected add-on costs.
• Essential business tools: Features like call routing, texting, and voicemail transcriptions should come standard.

3. Softphones 

A softphone is an app you install on your phone, computer, or tablet to make and receive calls and texts over the internet. It’s like how you get Netflix to watch movies without needing a TV or a DVD player.

Softphones are quick to set up, cost-effective, and especially useful for remote or on-the-go teams. Your team can use existing hardware or their own devices without giving out their personal numbers to customers.

You’ll need to download the app from your VoIP service provider. You can do this from their website or through the App Store or Google Play. Then log in with your account to start making calls.

4. Optional: VoIP phones and VoIP headsets

Physical desk phones and high-quality VoIP headsets can provide a more traditional calling experience, with clearer audio and hands-free convenience. They connect directly to the internet and are especially helpful for roles that spend most of the day on calls, like support or sales teams.

That said, they’re not required to get started with VoIP. Most businesses can use softphone apps on existing devices and still have a good experience.

Key terms you might encounter on your VoIP journey

As you explore VoIP, you’ll likely come across a few technical terms. Here’s a quick glossary in plain language so you can understand what they mean and why they matter for your business.

📌 Be sure to bookmark this guide so you can refer to this glossary when you need it.

Term	What it means	Why it matters to you
VoIP, or Voice over Internet Protocol	Technology that lets you make calls over the internet instead of phone lines.	Lower cost, more flexibility, and extra features for your business.
Softphone	An app on your computer or phone for making and receiving VoIP calls.	Lets you use your existing devices, no extra hardware needed.
PBX, or Private Branch Exchange	The behind-the-scenes phone system that manages how calls are routed between your team and customers.	Lets you have multiple extensions, transfer calls, and share numbers — essential for handling calls professionally in any growing business.
Hosted PBX	A business phone system that runs in the cloud using VoIP, like how FaceTime uses the internet for calls.	Gives you enterprise-level features without installing or maintaining hardware on -site.
SIP trunking	A patch-up method of connecting your PBX to the internet for VoIP calls.	If you already have a PBX, SIP trunking can move it to the cloud without replacing everything.
Number porting	Moving your existing business number to a new carrier or service, like VoIP.	Keeps your current number so customers don’t have to update contacts.
QoS, or Quality of Service	A setting that prioritizes voice traffic on your network.	Keeps calls clear even if other online tools are in heavy use.
Jitter	Small, uneven delays in how voice data travels over the internet.	Too much jitter makes calls sound choppy. A good provider helps keep it low.
Latency	The time it takes for your voice to travel to the other person.	High latency can cause awkward pauses during calls.
Packet loss	When bits of voice data don’t reach their destination over the internet.	Even small amounts of packet loss can make calls sound choppy or cause words to drop out. A good VoIP provider helps keep this to a minimum.
PSTN, or Public Switched Telephone Network	The traditional network of landline phone lines.	Instead of using PSTN lines, VoIP calls travel over the internet.

How to set up VoIP in 7 steps

Follow these seven steps to get your system up and running so you can start making and receiving calls right away.

1. Test your connection

Before setting up VoIP, make sure your internet connection can handle calls. Each VoIP call only needs about 100 Kbps of bandwidth, which is less than streaming music, but you’ll want enough capacity for multiple calls at once.

Run a speed test to check your connection. You can use:

• Fast.com for a simple test of overall, download, and upload speed
• Speedtest-cli for a more thorough breakdown of your internet performance, including metrics like download, upload, latency, and packet loss

Here’s what to look for:

• Jitter: under 30 ms for clear audio 
• Latency: under 150 ms for minimal delay 
• Packet loss: below 1% to avoid choppiness

For the most stable connection, plug your device into your router with an Ethernet cable. WiFi works just fine, but it’s more affected by other devices and interferences.

2. Decide on your hardware

You don’t need special hardware to run VoIP — most businesses get started using the computers and smartphones they already have. That said, if you prefer a more traditional setup, you can choose from the following options:

VoIP desk phones and headsets

Some of the most common VoIP hardware includes VoIP headsets and desk phone handsets.

Headsets can be especially useful for reps to take calls around the office, hands-free. You can find them starting around $17, with high-end models costing over $300.

Desk phones are useful if your team spends most of the day on calls and prefers a traditional handset. Options range from basic models around $50 to advanced phones priced in the hundreds, depending on features.

Analog telephone adapters

If you’ve already made a big investment in analog phones and want to keep using them, or you prefer the look and feel of a traditional desk phone, you’ll need a VoIP adapter.

An adapter connects traditional phones to the internet by converting their analog signal into digital, enabling WiFi calling.

Your adapter should come with instructions: some models work when plugged into the router. Others go between the modem and the computer, and still others might need an Ethernet cable or WiFi to function.

That said, most small businesses skip adapters and instead use softphones on their existing devices, since it’s faster and more cost-effective.

💡 FYI: You might see the term “SIP” — not to be confused with SIP trunking — when looking at adapters or VoIP phones. It’s simply the technical standard that most VoIP devices use to manage calls. If you’re using a softphone app or a hosted VoIP provider like Quo, you don’t need to worry about it — it’s all handled automatically.

3. Choose your VoIP provider

The platform you pick can make or break your experience with VoIP. Here’s how to pick the best VoIP provider for your business:

1. Features

Small and growing businesses should look for VoIP features that help them stay responsive to customers and work efficiently with a small team. 

For example: 

• Shared numbers: Multiple team members can call, text, and manage voicemail from the same number.
• SMS and MMS support: Let you send and receive text and rich media like images from your business number.
• Texting automations: Includes things like scheduled messages and auto-replies, helping you stay in touch with customers even when you’re busy or it’s outside business hours.
• Call handling features: Includes ring groups — sending calls to multiple team members at once or in sequence — and IVR phone menus — directing callers to the right person or department. Help customers reach the right person faster.
• Call recording and summaries: Keep records of customer conversations for training, quality control, or resolving disputes.
• AI voice agents: Answer calls automatically, handle common questions, and capture key details so you never miss opportunities when you can’t pick up.
• International calling and texting: Lets you connect with customers and partners abroad from the same business number, without switching platforms or paying exorbitant rates.
• Integrations with business tools: Connect your phone system to apps you already use, like Slack, HubSpot, or Zapier, to save time and keep information organized.

2. Scalability

If you’re a growing business, choose a business phone system that makes it easy to add users and numbers as you grow. Otherwise, you may end up switching systems later, which can be costly and disruptive. 

Here’s how to spot a scalable system:

• Add or remove users quickly: No need for new hardware or on-site tech support. For example, Quo lets you add new users simply by entering their email to send them an invite.
• Flexible numbers: Assign new VoIP numbers, share existing ones, or transfer numbers between team members.
• Multi-location support: Manage different business locations or team members under one account.
• Easy upgrades: Add features and move to a new plan without interrupting service.
• Ongoing improvements: Look for providers that add features regularly and integrate with your existing tools. That way, you’re not forced to switch as you grow.

With Quo (formerly OpenPhone), you can share a number with teammates or assign individual ones in just a few clicks. All settings — from call routing to voicemail — can be managed online or in the app, so scaling your system never slows you down.

3. Long-term value

The price you see on a provider’s website only gives you an idea of the upfront cost. What really matters is the long-term value. So make sure to consider the hidden or future costs that could make a provider more expensive over time — not just the base plan and add-ons you’ll need right away.

Here’s what to watch out for:

• Per-user pricing so you’re only paying for what you need
• No minimum user requirements. Some providers lock advanced features behind higher-tier plans with minimum seat requirements, which forces you to pay for more than you need.
• No long-term contracts. This lets you switch or downgrade without penalties if your needs change.
• Hidden fees like messaging or calling caps, early termination fees, setup or activation fees, number porting fees, or declined payment fees.
• Necessary features as add-ons, like unlimited calling and texting, shouldn’t be considered add-ons. When you pay for a phone system, you should at least get the essentials.

Already have some providers in mind? Use our VoIP cost calculator to compare how much you can save with Quo.

4. Security

Small businesses can be targets for fraud or unauthorized access, so choose a VoIP provider that takes security seriously.

Here are a few things to look for:

• End-to-end encryption: Protects calls and messages so customer data stays private.
• Two-factor authentication or 2FA: Adds an extra layer of security when logging in.
• User permissions: Lets you control who can change settings, manage billing, or access sensitive information.
• Automatic updates: Ensures your system is always protected with the latest security patches.
• SOC 2 compliance: Confirms through independent audits that a provider securely manages data and protects customer privacy. This is especially important if your business handles sensitive information, like in legal or financial services.

🔒 Learn more about security at Quo so you can make your choice with ease of mind.

5. Reliability

For a phone system to truly support your business, it has to work when you need it. 

Look for:

• High uptime guarantees: Aim for at least 99.99% uptime.
• Redundancy: Providers should have backup servers and systems in place so calls and messages continue even if one system goes down.
• Real-time status updates: A public status page makes it easy to check if there’s an outage, giving you transparency and peace of mind. Here’s Quo’s real-time status page, for example:

4. Get a business phone number or port in an existing number

Once your provider is sorted, it’s time to choose a business phone number. You can either get a new number or port over your existing one. 

1. Get a new number

If you’re starting fresh, you can pick:

• A local number, like a US or Canadian number
• A toll-free number
• A vanity number 

With Quo (formerly OpenPhone), you can use our phone number generator tool to search by area code, city, or toll-free prefix to quickly find the right fit. Each new Quo user automatically gets a new local — US or Canadian — or toll-free number.

2. Keep your existing number

If your customers are already familiar with your number and you want to keep it, you can just port it over to your new VoIP provider.

💡Note: To avoid disruptions or losing your number, start the porting process before canceling your old service. If you’re on a tight timeline, ask your provider for an estimated port completion date so you can plan better.

How to port your number to VoIP

1. Make sure your number is eligible for porting. For example, Google Voice doesn’t let you port in toll-free numbers at all.
2. Inform your old provider you’ll be switching.
3. Send the necessary information to your new provider. This includes your business information, phone bills, a Letter of Authorization, and more. Check your new provider’s porting guidelines for the exact documents needed.
4. Submit the port request and wait for the process to be complete.
5. Cancel service with your old provider.

If you use Quo, you can try out the platform for free with a seven-day trial using a temporary number. Then once you confirm it’s a good fit, you can go inside the app to easily port any existing US, Canadian, or North American toll-free numbers for free.

📚Further reading: How long does it take to port a number

5. Set up your VoIP system

Finally, it’s time for the good stuff: setting up your small business phone system.

You can go the software-only route for a quicker and simpler setup, or you can get hardware involved. Most small businesses can be up and running in minutes — especially if you choose a software-based setup.

Software setup, the easy way 

You can get set up on Quo in a few easy steps:

• Sign up for an account. You’ll pay a monthly fee per user, similar to how you’d subscribe to Netflix or Spotify.
• Download the softphone app on your phone or computer, or log in from the web to start using your business number anywhere.
• Choose your business phone number. Choose between local, toll-free, or vanity numbers.
• Complete carrier registration if you plan to text US numbers. Quo walks you through this in-app, and once it’s done, you can send unlimited texts to any US or Canadian number.

That’s it — you’re ready to go. Quo handles all the backend infrastructure, from hosting the system in the cloud to keeping everything secure and up to date. Most businesses can get set up in 15 minutes or less.

Hardware setup, the hard way

Installing hardware can look different, depending on your setup — for example, whether your router supports Power over Ethernet, or PoE, or if you’re using wired headsets with specific connectors. 

For businesses that use desk phones, most models will plug directly into your router or connect with a power adapter and Ethernet cable. 

But don’t worry, your provider will give step-by-step instructions for your specific phone, so setup can be pretty straightforward.

That said, most cloud-based VoIP systems for small businesses don’t require on-site PBX hardware. This way, you avoid the complexity and high costs of traditional phone systems. For reference, an on-premises setup for a team of five can cost around $2,605. With hosted VoIP, you can get started for under $50.

6. Configure your business phone settings

You’re almost ready to go, but first, you need to add business phone settings so that you can navigate your VoIP phone calls with ease and avoid missed calls. 

Foundational settings 

For the best use of your time, start by configuring these basic settings:

• Business hours: Ensures calls are handled differently inside vs outside working hours. 
• Voicemail greeting: Sets the right first impression when you can’t answer.
• Auto-replies: Set expectations and acknowledge messages, even when you’re unavailable.
• Call forwarding rules: Make sure important calls don’t get missed.
• User permissions and roles: Control who can change settings, manage billing and subscriptions, access sensitive information, or add/remove users.
• Mobile app setup: Download your provider’s app so you and your team can make and take calls from anywhere. This is useful for remote and field workers.
• Integrations: Connect to tools you already use — like Make, Zapier, Slack, or HubSpot — to automate tasks or log calls in your CRM.

Advanced call routing features

With the basics taken care of, set up your call flow so customers always reach the right person, with minimal intervention on your side.

On Quo, you can use the call flow builder to configure these steps visually — just drag and drop.

Here are some call routing features to set up for the best call handling:

• Ring groups: Send calls to multiple team members at once, in random batches, in a set sequence, or to a single user.
• Auto-attendant or phone menu: Routes calls to the right person/department from the start using a menu, like “Press one for sales, or press two for support.”
• Do not disturb, or DND, call forwarding: You can set up forwarding rules for when you are in DND mode, ensuring that calls are still handled appropriately.
• AI voice agent: If available, add your voice agent, called Sona in Quo, to your call flow to capture overflow calls. 

7. Invite your team

Finally, add your team members to your phone system. This makes it easier to respond to customers quickly, share visibility into conversations, and hand off calls smoothly.

To invite team members to your Quo workspace, navigate to Settings, Members, and click Invite your team. Enter their emails, assign them a role and number, and send the invites.

Once you’ve invited your team, you can manage their user permissions. For example, Admins can manage team members and phone numbers and configure settings. But they can’t access billing information or add/remove users. 

Members, on the other hand, have limited administrative access and can’t modify workspace settings. They can simply use the workspace to communicate with customers. 

Troubleshooting common VoIP issues

Even the best systems have hiccups from time to time. Here are some common VoIP issues and how to troubleshoot them. 

Low call quality or choppy and distorted sound

Low call quality or bad sound is often caused by a weak internet connection or too many devices using up your bandwidth, though sometimes it can be as simple as not using a headset. 

Fix it by: 

• Switching to a wired connection or moving closer to your router
• Closing apps that use a lot of bandwidth
• Using a headset for clearer audio
• Checking with your provider to see if there are issues on their end
  

💡 Check out more information on improving audio in our guide to call quality.

Calls dropping mid-conversation 

Dropped calls are a VoIP problem that usually happens when your connection briefly cuts out.

Fix it by:

• Pausing large downloads or streaming during calls
• Asking your internet provider about enabling QoS, or Quality of Service
• Restarting your router to clear temporary issues

One-way audio

If you can hear the other person but they can’t hear you, or vice versa, it’s often due to network settings blocking the audio stream.

Fix it by:

• Restarting your VoIP app and router
• Contacting your provider to check firewall settings if the issue continues
• Isolating if it’s an issue with your headset

Can’t make or receive calls

If calls aren’t going through at all:

• Make sure you’re connected to the internet and logged into your VoIP app
• Check if your provider is experiencing an outage. Quo, for example, has a public status page

App not ringing 

If calls show up as missed but your phone or computer never rang, check your device’s notification and sound settings.

Make sure the VoIP app has permission to send alerts and isn’t silenced by Do Not Disturb mode.

6 best practices for a smooth VoIP experience

For the best VoIP experience, keep a few best practices in mind:

1. Make test calls before launch: Check sound quality, routing, and voicemail so you can fix any issues before customers start calling.
2. Plan your number port early: Number porting can take five to 12+ business days. So make sure to start the process early.
3. Set up a backup for taking calls: Forward calls to a mobile number or secondary number if the internet goes down.
4. Have an after-hours plan: Use voicemail, auto-replies, or Sona so you can still help customers and capture leads outside business hours.
5. Train your team on key features: Make sure everyone knows how to transfer calls, check voicemail, and use shared numbers — it speeds up responses and avoids missed messages.
6. Monitor missed calls regularly: Track missed call volume and look for patterns — like certain times of day or team members — so you can address the root cause.

Set up your VoIP phone system today with Quo

VoIP systems are slowly replacing traditional phone lines, offering more flexibility, advanced features, and value for growing businesses. 

Quo makes it easy to skip the hassle of traditional setups and go straight to connecting with customers. We’re also always adding new features and updates to make sure we keep up with your needs. 

For example, Quo gives you:

• Unlimited calls and texts to the US and Canada
• Texting automations 
• Local and toll-free numbers
• Call routing and IVR
• Collaboration features, like internal threads and shared numbers 
• AI features, like Sona, and call transcripts and summaries
• Call recording 
• Integrations with over 7,000 tools and our Quo API

We’ll take care of the phone stuff; you take care of your customers. Sign up for a seven-day free trial today.

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