Small Business Phone Systems: Types, Features, and Costs Explained

Small business phone systems remain essential, even in the digital age. Modern solutions connect remote and on-site teams while providing a seamless customer experience for inbound callers. With a professional business phone number and the right features, you can take calls and join video meetings from anywhere.

Understanding how different types of phone systems work can help you choose an affordable service. Explore various phone technologies to see how functionality and costs differ.

What is a business phone system?

A small business phone system is a communications setup for managing calls from a business phone number. It offers centralized billing, multiple phone lines, and call management features. Although you can route calls over analog or digital networks, internet-based setups have largely replaced traditional landlines in small businesses.

Modern office phones use Voice over Internet Protocol (VoIP) technology. VoIP converts voice calls into digital packets and transmits them over the internet. Less common are conventional analog phones known as plain old telephone services (POTS), which rely on physical phone lines, i.e., copper wires installed by telecom companies.

Types of small business phone systems

The main types of small business phone systems are VoIP, landlines, and virtual phone services. These solutions provide advanced features for today’s workforce. However, unless you live in an area without a reliable internet connection, the landline versus VoIP debate has a clear winner: VoIP phone service. Explore the differences between analog and digital systems to find the right platform for your company.

Landline business phone systems

Traditional landlines transmit calls over the public switched telephone network (PSTN). Phones, fax machines, and credit card payment terminals connect to an analog phone jack inside your office. One jack typically supports two separate phone lines.

For additional capacity, telecom carriers offer the following solutions:

Public branch exchange (PBX) systems: These are private telephone networks with advanced features, including an auto attendant, extensions, and customized call menus. On-site PBX systems use expensive equipment maintained by an IT team.
Key system units (KSUs): This service supports five to 40 phone lines and provides basic features such as call hold and conferencing. KSU systems require a central, wall-mounted control unit and cost less than on-premises PBX setups.

Hosted VoIP and cloud PBX phone services

Many small businesses choose cloud-based VoIP services because they don’t require on-site infrastructure, and the provider maintains the servers. This type of phone system uses session initiation protocol (SIP) trunking, a standard that supports multimedia communications, including text messaging and video calls.

Cloud solutions provide call forwarding and call transfer along with internet protocol (IP) PBX capabilities, like auto attendants for efficient call routing. It offers flexibility in how you receive calls, which devices you use, and so on, making them a popular small business solution.

Larger companies may host their VoIP system on-site, similar to on-premises PBX phone systems. This approach requires higher upfront capital investment but has lower monthly fees.

Virtual phone systems

A virtual phone system is a type of VoIP. It forwards calls to an existing phone number, like a cell phone, landline, or, in some cases, another VoIP number. Virtual phone apps offer many of the same VoIP system benefits, including the ability to answer calls from anywhere. But it may have fewer advanced features than hosted PBX services. Virtual phones are an affordable choice for startups and solopreneurs wanting to add a second line to their mobile devices.

Unified communications as a service (UCaaS)

Most cloud-hosted telephony systems on the market are unified communications as a service (UCaaS) platforms. As the term implies, a unified communications platform combines multiple communication methods (phone, video conferencing, and chat) on a single platform and is hosted in the cloud. A unified communications phone system may also have real-time collaboration tools, digital faxing, and file-sharing capabilities.

Business phone hardware and equipment

Virtual PBX and VoIP systems require only an internet connection and a device, like a mobile phone or computer, to handle incoming and outgoing calls. You can access the VoIP app interface via a web browser or a softphone app. However, brick-and-mortar locations may need desk phones for reception areas and shop floors.

Small businesses can use VoIP apps or devices, such as:

Softphone apps: This turns your mobile phone or desktop computer into a full-featured business phone system, allowing you to access most IP PBX and communication features for call management. Providers offer softphone apps for iOS, Android, Mac, and Windows.
IP phones, aka VoIP phones: These devices replace analog desk phones but function the same, allowing users to park or transfer calls. Your VoIP provider may sell or lease IP phones and equipment. Instead of capital expenditure, you can spread your costs to monthly payments.
VoIP headsets: If your business receives a lot of phone calls or you operate a small call center, VoIP headsets are a must-have. These headsets can be wired or wireless and connect to mobile phones or computers.
Analog telephone adaptors (ATAs): These devices convert analog signals from traditional fax machines or desk phones into digital data. If you’re switching from a landline to a VoIP phone system and have an office full of analog phones, you can keep using this equipment.

VoIP features and functionality vary by the service provider and plan. However, most business systems bundle voice, video, and messaging tools in a single app.

Estimated costs and hidden fees of business phone systems

Small business VoIP pricing ranges from $10 to over $60 per user per month. Add-ons for AI tools, premium integrations, or high-volume texting increase total costs. Vendors offer lower rates if you pay one or more years upfront, but this may lock you into a contract with early termination penalties.

Unlike landline services, VoIP doesn’t require on-site wiring (except for your internet connection). This means hosted business phone systems have little to no upfront costs. In contrast, installing an on-premise PBX system can cost thousands upfront.

As with most business software, the price you see online is typically less than you’ll actually pay after taxes and fees. Vendors may disclose the details in fine print, but it’s important to review your contract and terms carefully.

Watch for hidden costs and fees, such as:

Taxes and surcharges: The price listed for VoIP services usually doesn’t include state and local taxes, carrier surcharges, or administrative and regulatory fees, like the Federal Universal Service Fund (USF) and E911. These add up to 20% to the base cost.
Number porting fees: Many vendors offer free porting, but some charge a one-time fee of $15 to $40. Costs may be higher for toll-free phone numbers and landlines in certain locations.
International calling rates: Most VoIP providers bill separately for international calls, with per-minute fees ranging from less than a penny to over $3. If you frequently call specific regions, compare rates between vendors.
Activation or setup fees: While most cloud-hosted systems have no activation fees or waive costs in most cases, on-premise phone services can have hefty setup and installation fees.
Contract termination penalties: Canceling phone service before your contract ends is expensive, generally costing up to 75% of the remaining monthly fees per phone line.
Business texting registration costs: The Campaign Registry (TCR) vets and registers brands to reduce spam. VoIP providers pass fees to users. Standard TCR fees include one-time costs of $4.50 per brand and $15 per campaign, plus a monthly fee of $1.50 to $10 per campaign.

Features and advanced capabilities for VoIP phone systems

VoIP features and functionality vary by the service provider and plan. However, most business systems bundle voice, video, and messaging tools in a single app. Many also offer artificial intelligence (AI) features. With AI-powered business phone systems, small businesses can summarize calls and meetings.

Here are a few things you can do with a softphone app:

Call management tools: Call forwarding, ring groups, and virtual receptionist (auto attendant) features enable seamless call flows.
Voicemail transcription: Read incoming messages on softphone apps and get text or email notifications.
Audio and video conferencing: Connect three or more callers on a single line for audio conferences or interact with hundreds in video meetings.
Call recording: Set up automatic or on-demand call recording for compliance purposes or to review when assessing customer service or sales.
AI-driven features: Use AI for VoIP to take notes during voice and video calls, transcribe interactions in real time, or analyze sentiment.
Team messaging: Remote and hybrid employees can collaborate in real time and share files in team chat.
Integrations: Use VoIP integrations with calendars and customer relationship management (CRM) software to personalize conversations and set appointments.

In addition, most phone system options for small businesses offer unlimited calling within the domestic United States and sometimes to Canada, Puerto Rico, or Mexico. Low-priced virtual and VoIP systems may offer metered calling plans, which are best for users who need a cheap business phone number. International calls are usually pay-as-you-go. However, a VoIP service like 8x8 or GoTo Connect lets you make international calls to certain destinations for free.

Key considerations when comparing business phone vendors

To find the right VoIP service for your small business, think about how and where your employees and customers communicate. Some platforms stand out for remote collaboration, offering robust video conferencing and messaging tools. Others provide basic but reliable softphone apps for teams in the field. Choose a business phone system that meets your needs for usability and scalability.

Consider the following when comparing business phone vendors:

Administrative complexity: Some phone systems are powerful but require hours of admin work to configure call routing, permissions, integrations, and features. First-time system administrators may prefer simpler user management tools and intuitive dashboards.
Integration depth: Make sure the platform connects to the tools your team uses and shares the right information. Native integrations are easier to set up than application programming interfaces (APIs), but some perform poorly, requiring repeated configuration or sending data only one way.
Quality and availability of customer support: Check support hours, response times, and communication channels. Also, check the vendor's self-service resources to see if they provide high-quality materials, including screenshots, GIFs, and videos. Minutes add up when you’re waiting for help or looking for tutorials.
Scalability: Many platforms force you to upgrade plans when you add a business location, need extensions, or have more than a few ring groups. Review the limits for each feature and estimate the costs of adding users or advanced call management features.

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