What Is VoIP? A Complete Guide for Small Businesses

Transcription

running a business requires an agile communication system that you can use for both outbound and inbound customer contact as well as communication between colleagues this is where voip really shines voice over internet protocol is an internet-based telephony technology that allows you to completely avoid the glut of old school landlines voip is loaded with features in this guide we're going to help you understand what the technology is all about hey everyone this is corey mccraw the voip and ucas subject matter expert at fit small business for beginners voip can be very confusing which is why we created this guide so you can understand this technology better if you're watching this video on youtube you can find a full written rundown of the of the technology linked in the description box vape lets you make and receive calls over the internet which makes a high-speed connection absolutely essential but a lot goes on behind the scenes to assure that you have a seamless experience here's the step-by-step process for internet based calling this is the call initiation stage one of my favorite aspects of voip is how versatile it is you can literally make calls on your preferred device this includes your smartphone through an app a cell phone which can be used by a desktop or a laptop or through a desk phone which has the size and shaping of traditional landline office device most providers even make it a seamless experience to exchange calls between devices once your call is initiated the connection is made through either your office internet service or to your wireless carrier while some services do require you to have a carrier set up many will work through a wi-fi or ethernet wired signal so you don't have to already have a connection voip isn't just internet to internet the person receiving your call can be on landline cellular or internet-based connection you can reach out to them if they are using a virtual phone number through a voip carrier when it comes to the underlying technology voip first changes your voice into data packets that are transmitted over the internet while changing your voice to data and then transmitting it might seem like it would take time the process actually takes milliseconds even if you're calling from across the globe effectively any call made will take place in real time you won't notice any lag or slow down unless your internet connection is slow as i mentioned voip uses data packets to transmit your voice to your recipient still it needs to use a system that will help each receiver which are called endpoints communicate to do this voip technology uses a set of rules called protocols to ensure devices can talk to each other it routes data across networks and converts them to the appropriate signal based on ip addresses and transport protocols when it comes to the most basic aspect of voip you'll most likely always run into the session initiation protocol or sip this signaling protocol is the most general purpose technology inheritance voip and allows for the transmission of multimedia packets between groups of endpoints because they're so versatile sip sessions can not only send voice packets but video packets as well which is why many voip providers offer video conferencing capabilities rtp works alongside sip so that each endpoint can stream both audio and video media in real time this is simply a set of dedicated protocols for transmitting voice video and data it's an older technology in sip and is widely used in ip based video conferencing the transmission control protocol works alongside both rtp and sip tcp is oriented towards data connections so it has to first ensure that a connection is made before data is transmitted as a result tcp tends to be on the slightly slower side still to reduce the impact of packet loss t is a good protocol since it actually allows for the re-transmission of data packets the user datagram protocol or udp is far more common than tcp because it doesn't require connection it doesn't have any overhead for maintaining or terminating one there's also no inherent error checking as a result udp is comparatively fast and very efficient outside of price one of the chief reasons that voip stands out is due to its features rather than having to finagle various calling features from a landline provider many voip providers bundle in a wide array of default functionalities here are a few to consider while many take this feature for granted it's amazing how many quality of life editions are available for most voip providers with voip it's easy to find features like voicemail to text and visual voicemail so you have an easy way to interface with your messages voip systems also allow you to access your voicemail through your favorite endpoint be it an ip phone soft phone app or an analog phone with an analog telephone adapter also your provider will ensure interoperability with other features for example if your service has an auto attendant or interactive voice response system ivr you may add a phone menu option like press 5 to leave a voicemail here you can see the interface offered by rank central auto attendance provides your company with a means to correctly route customers to the right department there are also fine tuning features that allow you to route according to your schedule or office hours it's best to think of an auto attendant as a digital receptionist as you can see from the example which comes from go to connect you can completely customize your auto attendant to provide as many menu options as possible for your customers advanced systems support multiple auto attendants and sub menus omni channel ivr systems work with your auto attendant to gather customer details like their account number before your employee picks up the line in most cases you'll be able to record and upload custom greetings or use a tool to transcribe your text announcement into a voice greeting depending on your provider voip provides basic to advanced analytic reporting options this allows you to look at historical data as well as real-time info about your communication stack this also allows you to monitor things like customer sentiment set your schedules and adjust call flow for better customer service some providers specialize in delivering key performance indicators so you can tweak your business communications performance you also have the option to schedule reports and send them directly to others through email some analytics that you can drill down into include the status of call queues company phone numbers individual users or departments device status call quality and custom kpis by now most business users have heard of salesforce which is just one type of customer relationship management solution most first or second tier voip plans allow for crm integration so that customer data will automatically pop up when contact is made this type of integration also provides a single solution for both outreach and data delivery so that your agents will have to manage custom customer information in one application while calling on another this is an example of nextiva crm integration which is extensive call monitoring is typically considered a contact center feature but is also a handy feature for companies that just want to create optimized customer interactions this feature helps to you deliver consistent high quality experiences and identify training opportunities call monitoring tools also reduce onboarding time by allowing employees to take calls while you listen in and guide them as needed here's a quick screenshot of ringcentral's monitoring ui standard features include monitoring agent whispering which you use to send messages to your employees call bars you can take over a call and call recording conferencing is a major consideration for most businesses especially when you need to talk to multiple customers simultaneously wouldn't need to have virtual team huddles this feature is especially gaining traction as more businesses switch to a work from home paradigm both audio and video conferencing provides value but when seeking a voip provider noted each has varying capacities for example go to connect who you see in the image has a maximum participant count of 250 attendees but other providers may limit your team to 25. an increasing number of businesses are shifting away from the physical phone which is why voip's ability to work off of software is so advantageous software apps turn any compatible internet connected device into a voip phone download the application on your desktop computer laptop cell phone or tablet from there make and receive calls using your preferred device most features are readily available through the software and you're able to save money on investing in iphones or analog telephone adapters now that you're a bit more familiar with some of voip's most useful features let's take a look at the advantages and disadvantages of technology wait brings the omni channel into reality unlike landlines you can reach your customers where they prefer to be reached for example most providers like ringcentral nextiva and ipad allow you to make voip calls but also allow you to video conference and text as well some providers like nixtiva also allow you to even reach out via social media all these points of contact are managed by a single platform so it's easy to track customer interactions thanks to its cloud-based nature voip typically costs much less than on-premise space communication solutions or landlines in addition since the hardware is managed by the provider there's no need to provision cash for things like upkeep and upgrades this is all managed by your voip company want to add or remove users no worries simply make the change in your online admin portal for instant results your team doesn't have to update software or troubleshoot infrastructure issues because your voip provider handles it all from their end voip is cheaper than traditional landlines when it comes to international calling this is due to the fact that voip doesn't need to use the intercontinental copper lines to connect with your you with your customers there are plenty of muted weight providers like ring centroid nextiva that will provide you a very reasonable rate for calling hundreds of countries but in addition to this providers like 8x8 uma and go to connect have completely unmetered plans so you can call overseas frequently many providers also provide international numbers so your global customers can reach you overseas without calling out of their country this provides a means to expand your business without investing in local offices voip's advanced features include ai assistance call forwarding to your favorite device and more niche features like paging service integration and built-in team collaboration tools still voip does have its disadvantages if you're looking to make internet calls your connection will have to be able to support them likewise if you're using a voip provider and you lose internet or electricity for that matter you won't be able to make calls if you have an office that's relied on a standard plain old telephone service then you may have to upgrade your hardware for voip this will require you to replace your landline phones with ip phones saw phones on computers or smartphones or purchase analog telephone adapters to bring your landline phones to your voip service you also have the option to purchase a voip gateway which is an affordable solution if you only have a few desk phones and fax machines with voip you're sending your data over to internet anyone living in a digital age knows how risky that can be data packets and by voip can be intercepted by cyber criminals which is why encryption is critical both encryption and transit and net rest are needed for voip so make sure that your provider is delivering all of the security features you need to keep your data safe wait subscriptions range from less than 10 per user per month to more than 100 however the price varies amongst providers payment models and individual packages weight costs may increase for higher tier plans with advanced features like voice intelligence or interactive voice response systems in addition most providers offer several discounts for example major voip providers like ringcentral grasshopper nextiva offer annual discounts so that paying by the year is cheaper some providers also grant volume based pricing structures so that your service becomes cheaper as you grow you may know the answer to what is voip but do you know how it differs from a landline check out our guide to compare landlines to voip if you're ready to take the next step sign up for a free trial with a small business voip service and start taking business calls from almost anywhere

This transcript was generated automatically from the video's captions and may contain errors.

Written By
Sam Dadofalza
Sam Dadofalza
Reviewed By:
Published: May 19, 2023
Updated: Jun 4, 2025
11 minute read

Voice-over-internet-protocol (VoIP) is a type of phone system that uses the internet (instead of conventional copper wires) to make and receive calls. Compared to landline phones, it’s cheaper to set up and maintain and offers more advanced telephony features, such as automatic call distribution (ACD), interactive voice response (IVR) system, call analytics, and third-party integrations. In this article, we dive into the question of what is VoIP and how does VoIP work?

How Does VoIP Work?

To better answer the question “What is VoIP?” we need to understand how it operates. The process is simple: VoIP converts voice calls into digital signals and transmits them online. Here’s a breakdown of the steps involved in internet telephony:

  1. A user makes and receives calls through a computer, mobile phone, or VoIP phone.
  2. The VoIP platform or adapter converts voice audio into digital packets of data.
  3. The internet provider transmits the digital signal to the VoIP servers.
  4. The VoIP service provider delivers the call to the recipient once the servers receive the signal.
  5. The call recipient receives the call and hears crystal-clear audio on their phone.

Infographic titled How Does VoIP Work?

VoIP Protocols & Standards

Another way to understand what is VoIP calling technology is to know the protocols that make digital communication possible. VoIP uses a specific set of rules to transfer data over the internet, including:

  • Session Initiation Protocol (SIP): Establishes, maintains, and terminates sessions by sending messages in the form of data packets. The sessions may be voice calls between a customer and a service representative or a video meeting among team members.
  • Real-time transport protocol (RTP): Sends audio, video, and media traffic in real time while reducing jitter and packet loss, which affect VoIP call quality.
  • H.323: Allows sending of media data over packet networks (mostly used in video conferencing).
  • Secure real-time transport protocol (SRTP): Extends the capabilities of RTP and features stronger security measures, including encryption and message authentication on audio and video traffic.
  • Transmission control protocol (TCP): Establishes and maintains connection when devices and applications exchange data.
  • User Datagram Protocol (UDP): Allows computers and other devices to send data in a connectionless manner.

Top VoIP Providers at a Glance

The ideal VoIP solution provides the functionalities you need to accommodate the type of call volume your customer service team receives on a regular basis. Compare VoIP providers’ features and take advantage of the free trial offer to learn which platform suits your business operations best.

We compiled the top VoIP vendors in the market in the table below and included their respective features and pricing. To know more about these platforms, including their free trial durations, refer to our in-depth buyer’s guide on the best small business VoIP services.

VoIP ProviderMonthly Starting Price (per User)Key FeaturesLearn More
RingCentral logo.$30
  • Up to 10,000 toll-free minutes
  • Multi-level auto-attendant
  • On-demand call recording
RingCentral Review
Visit RingCentral
Nextiva logo.$30.95
  • Up to 12,500 toll-free minutes
  • Unlimited internet fax
  • Advanced call routing
Nextiva Review
Visit Nextiva
GoTo Connect logo.$27
  • Unlimited call queues
  • Hotdesking
  • International calling to 50+ countries
GoTo Connect Review
Visit GoTo Connect
8x8 logo$28
  • Hunt groups and ring groups
  • Call queues
  • Call activity analytics
8x8 Review
Visit 8x8
Phone.com logo$14.99
  • Unlimited calling minutes
  • Click-to-call
  • Audio conferencing
Phone.com Review
Visit Phone.com
Vonage logo.$19.99
  • Call announce
  • Call rerouting
  • Follow me
Vonage Review
Visit Vonage
OomaOffice logo$19.95
  • Call park
  • 7-digit dialing
  • Paging groups
Ooma Office Review
Visit Ooma

Advantages of VoIP

Now that we have answered the question of how does VoIP work, let’s discuss its pros and cons. In a nutshell, the benefits include more money savings, cheaper international calls, and more efficient call management.

So, what does VoIP do for business? Learn more about it by familiarizing yourself with the advantages of this internet-based phone system:

Reduced Overhead Costs

Businesses don’t need to rely on dedicated phone lines and equipment to use VoIP, meaning they are able to avoid the usual costs associated with landline phone systems. As your business expands operations, you won’t have to pay more for additional phone lines. If you choose a VoIP service with flat rate pricing, you’ll easily add users to the system in the platform’s admin settings without incurring extra costs.

Unlike traditional phone systems, VoIP doesn’t require hardware. Team members make and receive calls using the devices you already provided for work: laptops and mobile phones. This contributes to lower phone system setup expenses. According to VoIP statistics, the phone system reduces new business costs by as much as 90%.

RingCentral interface showing the settings for adding users, which include input fields for email, first name, last name, phone extension, type of phone, and phone number
Add multiple users to your RingCentral account (Source: RingCentral)

Business phone system RingCentral allows adding several users to the account through the Admin Portal. This makes the platform highly scalable, and most suitable for businesses that foresee growing operations in the future. Its extensive call management features, which include advanced call queue rules, call monitoring, and hotdesking, help you manage large call volumes. Connect the platform with third-party business tools to extend its functionality.

More Affordable International Calls

For those wondering what VoIP is ideal for, its best use case is making international calls. Its rates are significantly cheaper than the fees offered by landline system providers. For instance, Phone.com lets businesses call customers in Australia, Japan, and Mexico for only 3.9 cents per minute.

If you frequently make phone calls overseas, take advantage of VoIP providers’ unlimited international calling plans. Refer to our top picks for the best services for VoIP international calls.

GoTo Connect Admin interface showing advanced user settings and highlighting the option to enable international calling
Enable GoTo Connect users to call internationally by toggling on the option under Advanced User settings (Source: GoTo Connect)

VoIP solution GoTo Connect allows unmetered calls to 50-plus countries, including China, Germany, Ireland, Switzerland, and the United Kingdom. The international calling capability can be accessed via different devices, desktop, mobile, or browser, offering greater flexibility when connecting with overseas clients. Through its call management features, including unlimited ring groups and call queues, you’ll be able to make customer service delivery more efficient.

Streamlined Call Management

We define VoIP as a telephone system that enables calls over the internet. Beyond offering an alternative to copper-wired landlines, the system facilitates efficient call management. For one, it supports several devices, desktops, and smartphones. This means your team members are able to accommodate customer inquiries wherever they are, as long as they have a stable internet connection.

Aside from supporting flexible work, VoIP systems have built-in features that help businesses manage calls in a more streamlined manner. This includes:

  • Automated attendant: Gives callers instructions on how to connect with appropriate departments and agents
  • Call forwarding: Redirect customers automatically to alternate phone numbers
  • Call screening: See who is on the other end of the line and decide whether to accept, transfer, or send the call to voicemail
Nextiva interface showing the advanced routing configurations and the option to create an auto attendant
Create an auto-attendant on Nextiva to streamline inbound call management (Source: Nextiva)

Nextiva, another reliable VoIP system, includes the option to create auto-attendants in its advanced routing settings. Users are able to label virtual receptionists, set business hours and holiday schedules, and assign a phone number and extension. Additionally, you get to specify the caller ID’s first and last name, helping customers recognize your business quicker and increasing the chances of them picking up the call.

Disadvantages of VoIP

While VoIP is an excellent communication solution, it comes with a few drawbacks, such as internet dependence, the possibility of dropped calls, and cybersecurity risks. Knowing these cons helps you decide if VoIP is suitable for your business and better prepare you should you choose to adopt it. These are the disadvantages of using VoIP:

No Offline Functionality

Remember, a VoIP call means a call transmitted over the internet. The VoIP system completely relies on broadband technology to facilitate communication between users. The strength of your internet signal determines call quality, which means a weak connection will result in unintelligible or dropped calls. Before choosing a provider, run a VoIP speed test first to know if your network is ready to accommodate VoIP communications.

Power Supply Requirement

As much as VoIP needs a strong internet connection, it also requires an uninterrupted power supply. This means you won’t be able to use the phone system when there’s a power outage unless you invest in an electricity generator. During emergencies, landlines are more reliable than VoIP since they run on copper wires that aren’t affected by power interruptions and severe weather conditions.

Vulnerable to Cybersecurity Attacks

Since VoIP runs on the internet, it’s susceptible to cybersecurity risks. A common attack is Distributed Denial of Service or DDoS, which involves overwhelming servers with requests for connection or data, preventing you from using the VoIP system. Before subscribing to a specific platform, familiarize yourself with these threats and ask your chosen provider about their VoIP service’s security and compliance certification.

VoIP Costs

Now that we have answered what are VoIP call advantages and disadvantages, we move to the expenses involved in adopting this type of communication solution. The primary cost of a VoIP system is the subscription to a service provider. Most vendors charge a monthly fee, depending on the extent of the features offered. They often follow two pricing models:

  • Per user: The cost depends on the number of users in your phone system. RingCentral uses this pricing model, with an entry-level subscription costing $30 a month. This includes unlimited domestic calling within the United States (U.S.) and Canada, multi-level auto-attendants, and call queues. Its most expensive subscription is priced at $45 per user, per month, offering access to advanced call queue rules and routing, call monitoring tools like whisper and barge, and hotdesking.
  • Flat rate: The cost has a fixed fee regardless of the number of users. Grasshopper follows this pricing model, with a base-level subscription package priced at $31, offering one phone number, three extensions, and unlimited users. All the VoIP features, such as call forwarding, call transfer, and custom greetings, are included in all subscription plans.

Aside from your service provider’s pricing model, the following factors affect VoIP subscription cost:

  • Billing arrangement: Many VoIP service providers offer monthly and annual billing options. Those who choose annual billing get discounted rates. For instance, RingCentral offers up to 33% savings with yearly payments.
  • Number of users: Some VoIP vendors provide discounts for businesses needing several seats. Nextiva, for example, lowers its per-user subscription fees for five to 100-plus users.
  • Hardware: Although hardware phones aren’t necessary when using a VoIP system, some businesses prefer managing calls through internet protocol (IP) phones. Providers like RingCentral and Nextiva offer different hardware devices, like desk and conference phones, for sale and rent.

Before buying a subscription, ask the provider which VoIP services are included in each package. With this, you’ll be able to guarantee that your subscription has the features you need for managing business communications.

VoIP Features

Knowing about the phone system’s capabilities will help you better understand what is VoIP technology. Throughout VoIP history, the industry has seen rapid development in features offered by different providers. Below is a list of the most useful VoIP capabilities:

Call Management

Handle calls more efficiently by maximizing these call management tools:

  • Automatic call distribution (ACD): Let the system automatically route calls to team members or departments. The routing process follows specified criteria. For example, the incoming calls will be distributed evenly across available representatives or according to the order in which the agents appear on the list.
  • Interactive voice response (IVR): Connect callers to the right agents or teams through key press instructions. Advanced IVR systems are equipped with speech recognition capabilities so that customers simply voice their concerns or the department they’re looking for.
  • Call queues: Have a virtual line of inbound calls to organize the sequence of when clients will be served. The customers hear a welcome message when they enter the phone system, and custom music will play until an agent is available to take the call.
  • Call monitoring: Monitor live calls and intervene when necessary. The whisper feature lets you observe ongoing calls and hear the conversation between a customer and an agent. The barge feature lets you join the call and speak to all participants directly.
A live phone call being monitored on RingCentral. The user has the option to use "Whisper," "Barge," and "Take over."
Monitor live calls on RingCentral and use whisper, barge, and take over when necessary (Source: RingCentral)

Phone Numbers

Most VoIP subscriptions come with virtual phone numbers: local, toll-free, and vanity. Some provide phone numbers in international locations for an additional fee. Users are able to claim ownership of such numbers right from the VoIP platform.

Unified Communications

Some VoIP solutions feature team messaging and video conferencing features, which make collaboration among remote employees easier. For example, RingCentral’s chat lets you assign tasks, search keywords, and revisit previously sent files. Its video meeting tool hosts up to 200 participants for a maximum duration of 24 hours.

An ongoing meeting on RingCentral with four video thumbnails shown
Host video meetings right from the RingCentral desktop app (Source: RingCentral)

Call Analytics

Get an overview of important performance metrics to evaluate customer service efforts more strategically. VoIP platforms show the number of total inbound and outbound calls, answered calls, and missed calls in real time. You’ll also see how many calls are in the queue and which agents take the most calls.

Third-party Integrations

VoIP solutions work with different business tools, which allow users to increase productivity. Customer service representatives are able to deliver faster customer service when all the information they need is accessible in one place. Integrations include customer relationship management (CRM) systems, ticket management, marketing automation, and collaboration tools.

Zendesk interface showing a support ticket and a RingCentral dialpad on the right side of the screen
RingCentral integrates with the customer service solution Zendesk. (Source: RingCentral)

Differences Between VoIP & Landline Phones

VoIP and landline phone systems vary greatly in cost, infrastructure, and features. If you plan to switch from one tool to another, learn their differences to determine which suits your business better. Refer to the table below for the major distinctions between VoIP and landline phone systems.


VoIPLandline
Installation Cost$0$0 to $300
Average Monthly Cost$0 to $50$20 to $60 per phone line
InfrastructureInternetPSTN
Device FlexibilityWeb browsers, desktops or laptops, smartphones, and IP phonesAnalog phones
Voicemail
Call Recording
Auto-attendant
Business SMS
Video Conferencing
Third-party Integrations

To know more about the differences between the two phone systems, check out our VoIP vs landline guide. In a nutshell, we recommend VoIP for small to mid-sized businesses needing a budget-friendly, feature-rich communication platform, and landline for companies requiring a reliable system during power outages.

Which Phone System Is Right for Your Business?

When choosing between VoIP and landline, consider your budget and determine if you’re ready to cover the upfront costs and the monthly expenses. Take into account the functionalities you need in a business phone system. Advanced features, like call queues and various call routing configurations, are essential if you frequently receive a large volume of calls.

Finally, consider the infrastructure you have, if your office space is retrofitted with phone jacks and cables, or if you have a strong internet connection. To help you decide which business phone system to get, take the quiz below.

Which phone system is right for your business?

Frequently Asked Questions (FAQs)

Can I keep my landline number with a VoIP phone?

Yes. VoIP providers offer number porting services, allowing you to transfer existing phone numbers from one vendor to another. While some facilitate the process for free, others charge a fee separate from the subscription plan.

How do I convert a normal phone to VoIP?

Yes, you need a VoIP adapter, also called an analog telephone adapter (ATA). This device converts analog signals to digital signals and vice versa, enabling users to make VoIP calls using a landline phone. ATA plugs into the analog phone’s FXS port and the local area network (LAN) via the RJ45 port and Ethernet cable. Check out our top ATA picks.

Will VoIP replace landlines?

Yes. In fact, the Federal Communications Commission (FCC) already mandated decommissioning plain old telephone service (POTS) lines, which means telecom providers are not compelled to provide copper wire services and be subject to price caps anymore.

Instead, vendors are free to offer other phone system services, such as VoIP. Even without the order, VoIP will likely replace landlines as they offer greater flexibility, scalability, and money savings for businesses.

Bottom Line

Now that we tackled VoIP’s benefits, costs, features, and differences from landline phones, consider adopting this platform in your business operations. RingCentral is our top pick among VoIP providers, given its extensive call management capabilities, third-party integrations, and team collaboration tools. Sign up for its 14-day free trial to see if it fits your communication requirements.

Sam Dadofalza

Sam is an office tech writer at Fit Small Business, covering various topics including virtual phone systems, contact center platforms, and unified communications tools.

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