The Best Business Phone Lines in 2025

Choosing the right business phone line is crucial if you want to improve communication between your team, clients, and business partners. Our research has identified RingCentral Advanced, Zoom Regional Unlimited, and 8×8 Work as the top three business phone line providers for US companies in 2025, with GoTo Connect and Nextiva Engage offering strong alternatives tailored to specific business needs.

Below, we’ve directly compared the key strengths and potential drawbacks of each provider to help you clearly understand which business phone line suits your organization best. But if you want to know exactly which option is best for your medium-sized business and how much it will cost you right away, we suggest filling out our free quote comparison tool to get quick answers.

The Best Business Phone Lines in 2025

We recommend that you invest in Voice over Internet Protocol (or VoIP) phone lines and communication systems rather than landlines because they are cheaper, flexible, and have significantly more features. Here are our five best business phone lines for medium-sized US businesses, according to our research:

1. RingCentral Advanced: Best Business Phone Line Overall

RingCentral Advanced takes the top spot overall due to its extensive set of features, powerful integrations, and unmatched scalability, making it ideal for medium-sized businesses looking to streamline their communications.

Why is RingCentral Advanced a top business telephone system for medium-sized businesses?

RingCentral Advanced is perfect for medium-sized businesses that require a comprehensive communications solution capable of handling large teams and high call volumes. In our research and testing of its platform, we found that it offers sophisticated call management tools, including advanced Interactive Voice Response (IVR) and call routing capabilities, to provide smooth customer interactions even during busy periods.

One of its biggest advantages is the broad range of software integrations available, allowing seamless connections with over 300 applications, including popular Customer Relationship Management (CRM) platforms, helpdesk software, and team collaboration tools. There is also Application Programming Interface (API) support for custom integrations, too.

This integration flexibility sets RingCentral apart from competitors like GoTo Connect or 8×8 Work, which have far fewer ready-made integrations with third-party tools, and sets RingCentral Advanced up as a great choice for businesses with complex workflows or specialized/niche integration needs, such as sales-driven organizations or customer support centers.

Additionally, RingCentral Advanced has excellent employee training features, offering call whisper, call monitoring, and call barge functionalities. Call center operations or teams frequently onboarding new staff will appreciate these functionalities, which aren’t always a part of phone line packages such as Nextiva Engage.

Any reasons why RingCentral Advanced won’t be for your business?

Despite its strengths, RingCentral Advanced may not be the best choice for medium-sized businesses with simpler requirements or tighter budgets.

Its extensive capabilities come at a higher price point of $25 per user, per month compared to providers like Zoom Regional Unlimited ($15/user/month), which offers similar core features for $10 less per user, per month. That could make RingCentral Advanced too costly for businesses that don’t require the extensive integrations it offers.

2. Zoom Regional Unlimited: Best Value Business Phone Line

Zoom Phone‘s Regional Unlimited plan stands out as the best value option for medium-sized businesses, combining affordability with impressive functionality. Businesses receive a robust set of features, including advanced call management, video conferencing for up to 500 participants, and effective live training tools, all packaged at a notably lower price point compared to its competitors, especially RingCentral Advanced and 8×8 Work.

Why is Zoom Regional Unlimited a top business telephone system for medium-sized businesses?

Zoom Regional Unlimited offers exceptional value, particularly for cost-conscious businesses aiming to balance budget constraints with strong feature coverage. Its advanced call management system, including visual voicemail transcription, auto-attendant capabilities, and sophisticated call-routing tools, is comparable to higher-priced competitors like RingCentral Advanced and Nextiva Engage but without the cost.

As you may expect of a Zoom product, it’s an ideal choice for businesses with extensive video conferencing needs since it supports meetings with up to 500 participants on this plan – significantly more than providers such as GoTo Connect and Dialpad. Furthermore, Zoom’s intuitive interface allows businesses to benefit from minimal onboarding time, helping to improve operational efficiency without additional training costs.

Overall, Zoom’s comprehensive yet affordable package makes it a particularly attractive option for medium-sized businesses, especially those focused on cost-effectiveness without compromising on critical communication tools.

Any reasons why Zoom Regional Unlimited won’t be for your business?

While Zoom Regional Unlimited provides excellent value, it lacks some integrations available with competitors. Notably, it only integrates with Salesforce for CRM purposes, falling short compared to RingCentral Advanced, which integrates with a wider range of CRM platforms.

Similarly, Zoom lacks integration with customer-service live chat tools (such as WhatsApp), a strength found in RingCentral’s offerings, which could be important for businesses prioritizing multi-channel customer support beyond the supported channels.

Moreover, Zoom Regional Unlimited doesn’t offer calendar integration with common productivity tools like Google Workspace or Microsoft Outlook. With many businesses heavily reliant on integrated scheduling tools from these two teams, this could be a significant shortcoming compared to the likes of RingCentral Advanced and Nextiva Engage.

3. 8×8 Work: Best Business Phone Line For Large Teams

8×8 Work stands out as the top choice for medium-sized businesses managing larger teams or rapidly scaling workforces.

With comprehensive training and management tools, expansive video conferencing capabilities, and excellent global communication support, it’s specifically suited to businesses where extensive internal collaboration, staff training, and performance analytics are critical.

Why is 8×8 Work a top business telephone system for medium-sized businesses?

8×8 Work is a great choice for supporting large teams through its strong emphasis on management, training, and collaboration features. It offers advanced call management tools such as call monitoring, whispering, and barging (on certain plans), allowing supervisors to discreetly coach team members or intervene during live calls.

This is ideal for larger customer support or sales teams requiring frequent coaching or oversight, and compares favourably against GoTo Connect Phone System and Nextiva Engage, which lack comprehensive live call-coaching functionalities.

8×8 offers some of the best calling allowances for large-scale international businesses, too, with unlimited calling to 14 countries on its base plan and expanding to 48 countries in higher tiers. That’s better than RingCentral Advanced, for instance, which only provides unlimited calls within the US and Canada (international calls have varying rates, none of which are unlimited).

Additionally, 8×8 supports video conferencing with up to 500 participants, matching Zoom’s capabilities, but outperforming competitors like Dialpad and GoTo Connect, which have lower participant limits. Combined with its intuitive interface and detailed analytics dashboard, 8×8 can facilitate effective team collaboration and provide managers with clear insights into team performance.

Should you need help orienting you and your team to 8×8 Work, you can quickly contact 8×8’s customer support across multiple channels, including live chat, email, or phone. Most useful is that their phone line and live chat are 24/7, so you can call them around the clock whenever an issue arises. Plus, there’s also a user forum and online knowledge base with articles to help you without the need to wait for a customer service agent’s response.

Any reasons why 8×8 Work won’t be for your business?

While 8×8 offers numerous advantages, it may not be the ideal fit for every business. Namely, our research tells us that 8×8’s plans may be priced higher than some competitors, which could be a concern for budget-conscious small businesses.

We say those prices “may be priced higher” because 8×8’s pricing plans are private in 2025, meaning you won’t know exactly what you can expect for your business needs as they evolve. This bespoke model can make budgeting difficult for businesses looking for straightforward pricing transparency.

By contrast, Zoom Regional Unlimited, RingCentral Advanced and GoTo Connect Phone System provide clear upfront costs for both base plans and any add-ons, making them potentially better fits for teams needing simpler cost management.

4. GoTo Connect Phone System: Best Business Phone Line for Hardware Compatibility

According to our research, GoTo Connect Phone System is the best business phone line for businesses that have already invested significantly in their existing phone hardware, and want to transition smoothly to a new or alternative system.

We found the GoTo system could integrate with a wide range of popular hardware devices, including desk phones, headsets, and conferencing equipment from leading manufacturers such as Polycom, Cisco, and Yealink.

Why is GoTo Connect Phone System a top business telephone line for medium-sized businesses?

GoTo Connect Phone System is our top choice for hardware compatibility, offering flexibility to medium-sized businesses that prefer a straightforward setup without having to replace their existing phone equipment.

We found it provides exceptional ease of use, allowing users to simply plug and play with their current hardware, significantly reducing the onboarding effort and minimising downtime. That could be especially useful for dispersed, international teams all using different calling devices.

Compared to alternatives like Zoom Regional Unlimited and Nextiva Engage, which offer fewer hardware integration options, GoTo Connect thereby allows organisations to retain their existing infrastructure, avoiding additional expenses and technical complications.

Adding to its international appeal is GoTo Connect’s international calling capability. It supports unlimited global calling across over 50 countries, ideal for businesses with international customers, multi-national offices or remote teams. This places it ahead of competitors such as RingCentral Advanced, which includes more limited international calling in its standard packages.

Additionally, GoTo Connect Phone System offers strong core communication features, including reliable video conferencing, SMS messaging, and integrated e-fax capabilities. It provides a unified solution that medium-sized businesses can rely on for all essential communications, combining internal and external interactions smoothly within a single platform.

When testing the software, we found it to have a user-friendly interface that should allow users of varying technical proficiency to adopt it quickly, leading to less disruption and greater productivity compared to more complicated systems.

Any reasons why GoTo Connect Phone System won’t be for your business?

Despite its strengths in hardware compatibility, international calling, and user-friendly design, GoTo Connect Phone System is less impressive when it comes to advanced call management and analytics. It lacks certain sophisticated features such as call whispering, barging, and AI-driven analytics that competitors like RingCentral Advanced and 8×8 Work readily provide. Instead, these features are only available on GoTo’s Contact Center solution.

Medium-sized businesses that require detailed call analytics, live training tools, or more advanced call centre functionalities may find GoTo Connect limiting, potentially impacting team management or customer service effectiveness. If these advanced call features are critical to your operations, RingCentral Advanced or 8×8 Work would be stronger alternatives.

5. Nextiva Engage: Best Business Phone Line for Social Media Communications

If your business not only needs a new phone line but also integration with platforms like WhatsApp, Facebook Messenger and Instagram for social media marketing, then Nextiva Engage is the clear winner according to our research.

It’s the only phone system we assessed that includes native social media platform integration by default, since others like RingCentral and GoTo Connect only offer this on far more expensive Contact Center plans. That means your customer service and marketing teams can manage communications effectively from the same single, unified platform you run all other business communications with.

Why is Nextiva Engage a top business telephone system for medium-sized businesses?

As stated, Nextiva Engage’s strongest feature is its exceptional integration with social media and messaging apps, making it particularly suited to medium-sized businesses active in e-commerce, retail, or consumer-facing sectors, such as fashion brands.

Unlike competitors such as Zoom Regional Unlimited, 8×8 Work, and GoTo Connect Phone System, which lack comprehensive support for social media customer interactions, Nextiva Engage allows your teams to respond to customer queries, track conversations, and manage customer service efficiently across multiple platforms directly from its software interface.

Another benefit for medium-sized companies is Nextiva Engage’s robust customer experience tools, including detailed customer insights, unified conversation tracking, and social media-driven analytics. These features can help businesses better understand customer behaviour, improve engagement, and provide a consistent customer experience across all social media touchpoints. For marketing and customer service teams that rely heavily on social channels, Nextiva Engage delivers functionality unmatched by the other solutions on this page.

Additionally, Nextiva Engage offers strong internal communication capabilities, including video conferencing for up to 200 participants and team collaboration tools, creating a cohesive communications environment both internally and externally.

Any reasons why Nextiva Engage won’t be for your business?

Despite its impressive social media integration features, Nextiva Engage falls behind other providers in certain areas. For example, it lacks key advanced training functionalities like call whispering and call barging that 8×8 Work and RingCentral Advanced both offer, making it less suitable for businesses that place a premium on staff training or call monitoring.

Additionally, Nextiva Engage is positioned at a higher price point compared to cost-effective alternatives like Zoom Regional Unlimited, which offers arguably stronger overall functionality at a notably lower cost. Businesses on tighter budgets or those requiring extensive global calling capabilities at lower prices might find Zoom or GoTo Connect Phone System, respectively, more financially appealing.

What Is a Business Phone Line?

A business phone line refers to a telephone system, either landline (as you probably know already) or VoIP (Voice over Internet Protocol), designed for business use. Unlike traditional landlines, modern systems use the internet, enabling advanced features like multiple simultaneous calls, call forwarding, and voice or video conferencing.

Types of business phone line

There are three main types of business phone lines: Public Switched Telephone Network (PSTN), Integrated Services Digital Network (ISDN), and Voice over Internet Protocol (VoIP).

• Public Switched Telephone Network (PSTN): The original landline technology, PSTN transmits analog voice over copper wires. Despite modernization, its core functionality has remained unchanged since its invention in the 1800s.
• Integrated Services Digital Network (ISDN): Introduced in the 1980s, ISDN digitized landlines, enabling simultaneous voice and data transmission over PSTN wires. It offers clearer calls and faster data transfer compared to PSTN.
• Voice over Internet Protocol (VoIP): VoIP transmits calls over the Internet, replacing traditional phone lines. It supports advanced features like conferencing and call forwarding, eliminates physical limitations, and scales easily with business growth, making it the most efficient and flexible option.

Landline Phone Lines vs. VoIP Phone Lines

Now that we’ve defined what a business phone line is and its different types, let’s go in-depth on the difference between landlines and VoIP lines, focusing on three key categories: price, functionality, and mobility.

How Did We Compare the Best Business Phone Lines?