5 Best Business VoIP Service Providers Comparison (2025)
If you’re making telecom decisions at an enterprise level, you’re not shopping for basic call features. You’re seeking a scalable, integration-ready global voice solution that won’t break under pressure.
However, most Voice over Internet Protocol (VoIP) providers cater to the needs of smaller businesses. This is where a business VoIP service provider focused on enterprise solutions makes a difference.
From advanced call routing and customer relationship management (CRM) integrations to global number coverage and compliance, enterprise-grade platforms provide the infrastructure that supports complex voice strategies. But every provider is unique.
To choose the right one, you need to compare top players through an enterprise lens, focusing on the functionality that matters most when reliability, flexibility, and international reach aren’t optional.
Top business VoIP service providers in 2025
For enterprises in need of robust and scalable communication solutions, these VoIP service providers offer unique features that meet diverse business needs.
| AVOXI | Advanced call routing, CRM/PBX integrations, global number coverage, regulatory compliance, intelligent call distribution | High | 150+ countries | Salesforce, Microsoft Teams, Zoom, Webex and more | 24/7 |
| RingCentral | Unified communications, extensive app integrations, open API | High | 100+ countries | Salesforce, Zendesk, Google Workspace | 24/7 |
| Dialpad | AI-powered voice intelligence, seamless device switching, built-in analytics | Medium | 70+ countries | Google Workspace, Microsoft 365 | 24/7 |
| 8x8 | Multi-level auto attendant, unlimited calling, voicemail transcription | High | 120+ countries | Salesforce, Microsoft Teams, Google Workspace | 24/7 |
| Nextiva | Advanced call management, voicemail transcription, CRM integrations | High | 100+ countries | Salesforce, HubSpot, Zoho CRM | 24/7 |
1. AVOXI
AVOXI supports enterprises seeking a comprehensive business VoIP service provider with a global reach. Its advanced features cater to complex communication needs across multiple regions, helping companies establish a local presence and streamline international workflows. AVOXI empowers large organizations to maintain effective connectivity and compliance across diverse environments.
Key features:
- Global number coverage: Activate virtual phone numbers in over 150 countries, including local, toll-free, and mobile app options.
- Intelligent call routing: Route calls by time zone, agent skill, and priorities with real-time adjustments and failover options.
- CRM and PBX integrations: Connect seamlessly with platforms like Salesforce, Microsoft Teams, and Zoom through Session Initiation Protocol (SIP) trunking and APIs.
- Custom IVR builder: Create personalized, multi-level Interactive Voice Response systems with a drag-and-drop interface that lets you customize greetings, menus, and routing.
Cons:
- Advanced features like custom integrations are available only with higher-tier plans.
- Specialized features may require technical expertise to set up.
2. RingCentral
RingCentral offers a unified communications (UC) platform suitable for business owners who want extensive app integrations and customization. It caters to companies of various sizes, offering a scalable VoIP phone system with a wide range of calling features.
Key features:
- Unified communications platform: Combine voice, video, and team messaging in a single interface for streamlined collaboration.
- Extensive app integrations: Connect with tools like Salesforce, Zendesk, and Google Workspace to enhance productivity.
Cons:
- Smaller teams may find premium features expensive.
- New users may face a learning curve.
3. Dialpad
Dialpad distinguishes itself with its AI-powered business communications platform, offering features like real-time coaching and call summaries. This VoIP provider prioritizes simplicity and ease of use by integrating voice calls, SMS messages, and video meetings in one interface.
Key features:
- AI-powered voice intelligence: Deliver real-time transcription and insights to improve phone call quality and customer interactions.
- Flawless device switching: Transfer calls between devices without interruptions.
- Built-in analytics: Monitor real-time call analytics to track performance and make data-driven decisions.
Cons:
- Limited global coverage compared to other providers.
- Some advanced features may cost more.
4. 8x8
8x8 is a global VoIP service provider that offers a unified communications and call center solution. Its robust platform supports business VoIP services, video calls, and customer engagement, particularly for organizations with a global presence.
Key features:
- Multi-level auto attendant: Configure automatic call routing to direct callers to the appropriate department or individual.
- Unlimited calling: Make unlimited local and long-distance calls across the United States and Canada.
- Voicemail transcription: Convert voicemails into text for easy management and quick reference.
Cons:
- Advanced features may involve a learning curve.
- Certain features aren’t available in all regions.
5. Nextiva
Nextiva offers a comprehensive business phone system focused on reliability and ease of use. Catering to businesses looking for a straightforward, dependable communication solution, this VoIP provider offers a range of features, including unlimited calling, auto attendants, and integrations.
Key features:
- Advanced call management: Use features like call queuing, call grouping, and call screening to manage incoming calls.
- Voicemail transcription: Receive voicemail messages transcribed into text for rapid reading and response.
- CRM integrations: Integrate with popular CRM platforms like Salesforce, HubSpot, and Zoho CRM to streamline workflows.
Cons:
- Some integrations require higher-tier plans.
- The provider may turn off certain features for HIPAA compliance.
Features to prioritize in a business VoIP provider
Selecting the best VoIP service provider is crucial for enterprises aiming to enhance communication efficiency and scalability. Focus on these essential features:
1. Call quality
High-definition (HD) voice quality is vital for effective communication in customer service operations. Advanced VoIP systems offer better call quality than traditional landlines, resulting in clearer conversations and fewer dropped calls.
2. Reliability
A reliable business VoIP service provider should offer high uptime guarantees with their service level agreements (SLAs), typically exceeding 99.99%. This level of reliability guarantees communication channels remain available when you need them most.
AVOXI’s 99.995% uptime SLA ensures a stable and secure network for customers.
3. Scalability
As your business grows, your communication needs will change. A scalable VoIP solution lets you add or remove users, phone numbers, and features without significant disruption or cost.
Whether you're expanding to new locations or experiencing seasonal fluctuations in call volume, your VoIP service provider should offer flexible plans and the infrastructure to support growth.
4. Integration capabilities
A modern business VoIP service should integrate easily with your existing business tools, such as CRM platforms, productivity suites, and other essential applications. With CRM integrations, you can automate workflows, improve data accuracy, and provide a unified view of customer interactions.
5. Customer support
Responsive and knowledgeable customer support is crucial, especially when dealing with technical issues or implementing new features. Choose a VoIP provider with numerous support channels—including phone, email, and chat—and accessible, well-trained support teams.
Also, look for providers that offer dedicated account management for enterprise clients, ensuring personalized assistance and proactive problem-solving. Prompt and effective support minimizes downtime and provides a smooth user experience.
Understanding VoIP vs. traditional PBX systems
When evaluating communication solutions, it's important to understand the differences between hosted VoIP systems and traditional Private Branch Exchange (PBX) systems. While both manage business calls, their infrastructure, scalability, and features differ significantly.
Here’s how:
| Infrastructure | Cloud-based, operates over the internet | On-premises hardware, relies on physical phone lines |
| Scalability | Easily scalable, add or remove users via software | Limited, requires physical installation for expansion |
| Cost | Lower upfront costs, subscription-based pricing | High initial investment, ongoing maintenance expenses |
| Mobility | Accessible from anywhere with internet connectivity | Restricted to office premises |
| Maintenance | Managed by the service provider | Requires in-house IT support |
Understanding these fundamental differences will help you determine which VoIP phone service best aligns with your organization's operational needs, budget, and long-term communication strategy.
How can VoIP benefit your business?
Adopting a business VoIP service provider can transform your organization's communication infrastructure by delivering the following benefits:
- Cost efficiency: VoIP systems reduce average communication costs by 50%–75% by eliminating the need for expensive hardware and reducing call charges.
- Enhanced flexibility: Employees with internet access and a mobile device can make outbound calls and receive inbound calls from virtually any location—ideal for remote work and global operations.
- Advanced features: Access to capabilities like call forwarding, voicemail-to-email, video conference calling, and integration with CRM systems enhances productivity and customer service.
- Scalability: Scale communication effortlessly by adding users and features without major infrastructure overhauls.
- Improved reliability: Many VoIP providers offer high uptime guarantees and disaster recovery options, ensuring uninterrupted communication even during unforeseen events.
Why enterprises choose AVOXI for global VoIP solutions
Enterprises operating across multiple regions need a business VoIP service provider that delivers reliability, scalability, and seamless integrations. AVOXI offers enterprise-grade features tailored to meet these demands.
1. Extensive international number coverage
AVOXI provides access to virtual business phone numbers in over 150 countries, including key regions across the United States, Europe, and Asia. This extensive coverage helps enterprises develop a local presence globally, facilitating better customer engagement and expanding market reach.
2. Compliance with global regulations
AVOXI understands the importance of regulatory compliance and adheres to international standards like the General Data Protection Regulation (GDPR), Health Insurance Portability and Accountability Act (HIPAA), Payment Card Industry Data Security Standard (PCI DSS), and California Consumer Privacy Act (CCPA). This commitment assures enterprises they can operate confidently, knowing their communications meet stringent data protection and privacy requirements.
3. Robust integration options
Whether you prefer VoIP or SIP trunking services, AVOXI's platform easily integrates with leading enterprise systems, including CRM platforms like Salesforce and HubSpot, and communication tools like Microsoft Teams and 3CX. Integrations streamline workflows, enhance productivity, and create a unified communication experience.
Choosing the right enterprise VoIP provider for global communication
Enterprises today face the challenge of maintaining reliable, scalable, and compliant communication systems across multiple regions. Traditional phone systems often fail to meet these demands, leading businesses to seek advanced solutions.
Fortunately, platforms like AVOXI address these needs with extensive international number coverage, global regulatory compliance, and seamless integration with enterprise systems.
With AVOXI, your enterprise gains a partner equipped to support your global communication needs with a comprehensive, compliant, and integrated VoIP solution.
If you're ready to scale your communication operations with VoIP, schedule a demo to see how AVOXI can support your global voice and communication strategy.
Business VoIP FAQ
Voice over Internet Protocol (VoIP) is the technology that enables voice calls over the internet by converting analog signals into digital data packets. Users can make VoIP calls from various devices, including computers and mobile phones (Android or iOS), eliminating the need for traditional phone lines.
