6 Best UCaaS Providers for Global Enterprises (2025)

Seamless communication is the backbone of any global enterprise, yet many businesses struggle with fragmented systems that interfere with collaboration and customer interactions. That’s where Unified Communications as a Service (UCaaS) providers step in. They offer a unified voice, messaging, and video approach that connects teams across borders.

However, not all UCaaS solutions can handle the complexity of multinational operations. Enterprises need more than just video calls and instant messaging—they need scalable, compliant, and cost-effective voice infrastructure that works worldwide.

So, which platforms actually deliver? This guide breaks down the top six UCaaS solutions designed for global enterprises, focusing on scalability, compliance, and seamless global connectivity.

We’ll also explore how AVOXI enhances UCaaS with advanced call management and global voice solutions, helping businesses optimize their communication infrastructure.

6 best UCaaS providers for global enterprises (2025)

Here are six leading UCaaS providers with their key features and integrations:

Webex Suite Video conferencing, team messaging, file sharing, and AI-powered meeting assistance Microsoft 365, Google Workspace, and Salesforce
RingCentral Global availability, robust APIs, and scalable communication solutions Microsoft Teams, Salesforce, and Zendesk
8x8 Integrated Contact Center as a Service (CCaaS), global voice coverage, and real-time analytics Microsoft Teams, Salesforce, HubSpot, and Freshdesk
Zoom Video-first approach and extensive webinar capabilities Slack, Salesforce, and Microsoft 365
Nextiva Strong customer service focus, unified communications platform, and intuitive interface Microsoft Outlook, Google Contacts, Salesforce, and HubSpot
GoTo Connect Simple setup, reliable voice quality, and integrated team collaboration Slack, Microsoft Teams, Salesforce, and Google Workspace

Now, let’s take a closer look at each tool’s features, strengths, and weaknesses:

1. Webex Suite

Cisco’s Webex Suite is a comprehensive UCaaS platform for large enterprises that need robust security and advanced collaboration tools. It integrates messaging, meetings, calling, and events into a unified experience and uses AI for enhanced insights.

Webex Suite’s Control Hub interface showing call analytics (Source: Webex’s blog)

Features:

  • Video conferencing: High-definition video meetings that support large numbers of participants
  • Team messaging: Real-time chat with file sharing and integration capabilities
  • File sharing: Secure document sharing and storage within the platform

Pros:

  • Strong security features and a reliable choice for industries with strict compliance requirements
  • Streamlined workflows and enhanced meeting productivity with AI capabilities 
  • Deep integrations with other Cisco products and extensive enterprise features

Cons:

  • The cost is higher compared to some competitors.
  • New users unfamiliar with Cisco products may face a steeper learning curve. 

2. RingCentral

RingCentral is a leading UCaaS provider with a global reach and scalable solutions. Its unified platform offers many features, including voice, video, messaging, and contact center capabilities. 

In addition, RingCentral's open APIs allow for seamless integration with various business applications.

RingCentral’s overview dashboard shows active users on message, video, and phone (Source: RingCentral Support)

Features:

  • Global availability: Offers international phone numbers and localized support
  • Robust APIs: Enables seamless integration with customer relationship management (CRM) platforms like Salesforce, collaboration tools like Microsoft Teams, and other essential business applications
  • Scalable communication solutions: Supports businesses of all sizes, from small startups to large enterprises

Pros:

  • Extensive global presence and support for international businesses
  • Strong API ecosystem for deep integrations with existing systems
  • Highly scalable UCaaS solution that adapts to changing business needs

Cons:

  • The broad range of features and integrations can be overwhelming.
  • The pricing structure can become complex as you add features and users.

3. 8x8

8x8 offers a unified communications and contact center platform by combining UCaaS and Contact Center as a Service (CCaaS) in a single solution. It excels in global voice coverage and real-time analytics, which makes it a valuable tool for businesses with international operations.

8x8’s contact center overview dashboard displays agent performance metrics (Source: 8x8’s support page)

Features:

  • Integrated CCaaS: Combines unified communications and contact center functionality
  • Global voice coverage: Provides extensive international calling and number availability
  • Real-time analytics: Offers insights into call performance and customer interactions

Pros:

  • Simplified management of both internal and external communications
  • Reliable international calling from a strong global voice network 
  • Valuable insights for optimizing customer experience from robust analytics

Cons:

  • The interface and user experience can be less intuitive than some competitors.
  • Some advanced features may require additional add-ons or higher-tier plans.

4. Zoom

Zoom has become synonymous with video conferencing, but it also offers a comprehensive UCaaS platform that includes voice, messaging, and webinar capabilities. Its user-friendly interface and focus on video-first communication also make it a popular choice.

For businesses looking to expand globally, using virtual phone numbers with Zoom can improve call routing, enhance privacy, and support international business operations.

Zoom’s UCaaS interface shows a conversation between two product team members sharing business planning files (Source: Zoom)

Features:

  • Video-first approach: Emphasizes high-quality video conferencing and collaboration
  • Extensive webinar capabilities: Supports large-scale online events and webinars

Pros:

  • Exceptional video quality and reliable performance
  • Simple and intuitive interface for easy adaptability
  • Strong webinar and event hosting features

Cons:

  • Voice and messaging features may not be as robust as some dedicated UCaaS providers.
  • There is a rise in security risks despite Zoom’s continuous efforts to address them.

5. Nextiva

Nextiva provides a user-friendly UCaaS platform with a strong emphasis on customer service. It offers a range of features—including voice, video, messaging, and CRM integrations—to streamline business communications.

Nextiva’s UCaaS dashboard displays all communications and team collaboration features (Source: Nextiva’s blog)

Features:

  • Strong customer service focus: Provides excellent support and resources
  • Unified communications platform: Integrates voice, video, and messaging into a single interface
  • Intuitive interface: Supports easy setup and use, even for non-technical users

Pros:

  • Exceptional customer support and onboarding experience
  • Simple and intuitive interface for teams to adopt and use
  • Strong integration with CRM systems

Cons:

  • Nextiva may lack some advanced features that enterprise-focused UCaaS providers offer.
  • Its global capabilities aren’t as extensive as some competitors.

6. GoTo Connect

GoTo Connect is a robust UCaaS system that offers a unified communications platform, including voice, video, and messaging. It's known for its easy setup and reliable voice quality, making it a good choice for businesses seeking a straightforward UCaaS platform.

GoTo Connect’s messaging interface shows team collaboration and communication tools (Source: GoTo Connect’s UCaaS page)

Features:

  • Simple setup: Deploys easily, and management is seamless 
  • Reliable voice quality: Provides clear, consistent voice communications
  • Integrated team collaboration: Includes messaging, file sharing, and screen sharing

Pros:

  • Simple setup for easy deployment and management, even for small IT teams
  • Reliable voice quality and clear and consistent communications
  • Accessible for businesses of all sizes with affordable prices

Cons:

  • It may lack some of the advanced features and integrations in more robust UCaaS offerings.
  • Customization options are limited compared to other providers.

Essential UCaaS features

To maximize the benefits of UCaaS, it's crucial to focus on these key features:

1. Security and compliance

Enterprises that handle global communications must prioritize security and compliance to protect sensitive data and meet regional regulations. Leading UCaaS providers do so by offering end-to-end encryption, multi-factor authentication, and compliance with the General Data Protection Regulation (GDPR), Health Insurance Portability and Accountability Act (HIPAA), and Systems and Organization Controls 2 (SOC 2) standards.

Research shows that security breaches cost businesses an average of $4.45 million per incident, underscoring the importance of a secure business communication platform. Prioritize selecting a UCaaS provider that implements robust security measures to protect against this risk.

2. Scalability and global reliability

Scalability and global reliability are non-negotiable for enterprises that are expanding internationally. Traditional on-premises solutions struggle with high costs and limited coverage, while UCaaS solutions offer flexible, cost-effective alternatives that scale on demand.

Key considerations for enterprise scalability include:

  • Global data centers: A widespread network ensures low latency and seamless connections.
  • High-availability architecture: Redundancy in communication services prevents outages.
  • Flexible SIP trunking: Session Initiation Protocol (SIP) trunking supports high-volume voice traffic across multiple regions.

AVOXI enhances UCaaS scalability by providing enterprises with global virtual numbers and intelligent call routing. Businesses can use the platform to effectively manage their UCaaS and CCaaS platforms and voice infrastructure for seamless communication across diverse markets.

3. SLAs, uptime, and network performance

Downtime disrupts operations, which leads to financial losses and poor customer experiences. To prevent disruptions, top UCaaS providers offer service level agreements (SLAs) that guarantee at least 99.99% uptime. However, network performance depends on geographic redundancy, failover mechanisms, and real-time monitoring.

When evaluating UCaaS platforms, be sure to assess the provider’s:

  • SLA commitments: Ensure the provider offers financially backed uptime guarantees.
  • Global points of presence: Verify that more locations optimize call routing.
  • AI-driven monitoring: Choose a provider that predicts and prevents potential network issues.

With a reliable and unified network infrastructure, businesses can improve their uptime and reduce the total cost of ownership (TCO).

4. Integrations with enterprise software

Modern enterprises require UCaaS platforms that seamlessly integrate with CRM platforms, Enterprise Resource Planning (ERP), and helpdesk tools like Salesforce, Microsoft Teams, and ServiceNow. These UCaaS integrations eliminate silos, which allows teams to manage voice, video, and messaging from a centralized interface.

Must-have enterprise integrations include:

  • CRM sync: Logs call data and customer interactions automatically
  • Collaboration tools: Supports messaging, file sharing, and video meetings
  • APIs and automation: Enables workflow customization and real-time reporting

Many UCaaS solutions fail to handle complex global voice infrastructure. Fortunately, AVOXI fills this gap by providing SIP trunking and advanced Interactive Voice Response (IVR) solutions that extend the capabilities of standard UCaaS platforms.

5. Compatibility with existing IT and telecom infrastructure

Enterprises transitioning from legacy Private Branch Exchange (PBX) systems to cloud communications often require hybrid solutions. The best UCaaS services offer telephony integrations that support existing on-premises and cloud-based systems.

Key considerations for compatibility include:

  • Hybrid deployment options: Supports gradual cloud migration
  • Bring Your Own Carrier (BYOC): Allows enterprises to retain their preferred voice provider
  • Custom routing and number porting: Minimizes service disruptions

6. AI-powered call routing and analytics

The future of UCaaS is intelligent. AI-powered call routing reduces wait times by directing calls to the appropriate agent or department and enhances overall customer satisfaction. Beyond intelligent call routing, AI-driven analytics offer deep insights into call patterns, customer sentiment, and agent performance, allowing businesses to optimize their communication strategies proactively.

Features like real-time transcription, sentiment analysis, and predictive analytics empower businesses to make data-driven decisions and optimize communication strategies. These intelligent features are more than trends—they’re transforming how businesses communicate with their customers.

UCaaS pricing and TCO

Choosing the right UCaaS platform isn't just about features. It's also about understanding the total cost of ownership, including subscription fees, infrastructure costs, and scalability expenses.

Two primary pricing models dominate the UCaaS landscape:

  • Per-user pricing: With this model, businesses pay a fixed monthly fee for each user accessing the service. This approach simplifies budgeting, as costs scale proportionally with the number of users.
  • Usage-based pricing: With a consumption-based model, charges depend on usage metrics, such as the minutes or data you use. This model offers flexibility and allows businesses to align costs directly with their communication needs.

Beyond basic subscription costs, several additional fees can influence the TCO:

  • Onboarding fees: Some providers charge for initial setup and training services. These one-time costs can vary significantly, depending on the complexity of deployment and the level of support you require.
  • Infrastructure costs: While UCaaS solutions reduce the need for on-premises hardware, there may be expenses related to network upgrades or purchasing compatible devices to experience optimal performance.
  • Compliance fees: Although businesses in industries with stringent regulatory requirements might incur extra charges, the UCaaS solution adheres to necessary compliance standards, safeguards data, and maintains legal conformity.
  • Scalability expenses: As your organization grows, scaling your UCaaS solution to accommodate expansion might involve additional costs. Understanding how adding more users or integrating new features will affect your overall expenses is essential.

To accurately assess the TCO of a UCaaS solution, consider both direct and indirect costs over the system's life cycle. This comprehensive evaluation guarantees that you account for all potential expenses and provides a clear understanding of the financial commitment involved.

How AVOXI enhances UCaaS for global enterprises

While UCaaS providers offer a comprehensive suite of tools for internal collaboration, global enterprises often face limitations with seamless, high-quality external communications.

That's where AVOXI steps in as a crucial complement to your existing UCaaS setup. Think of it as the missing piece that ensures your global voice strategy is genuinely comprehensive.

But first, let’s pinpoint the limitations of UCaaS for global businesses and show how AVOXI addresses these challenges:

Limitations of UCaaS for global businesses

UCaaS platforms may not fully meet global enterprises’ needs due to:

  • Limited global coverage: Some UCaaS providers lack extensive international reach, which prevents seamless communication across diverse regions.
  • Integration challenges: Businesses that integrate UCaaS with existing systems may find it complex and discover it leads to inefficient workflows.
  • High costs: Global operations can incur significant expenses due to international calling rates and infrastructure investments.

How AVOXI improves UCaaS

AVOXI complements the capabilities of UCaaS solutions with the following:

  • SIP trunking: AVOXI's SIP trunking integrates with existing PBX systems, offering scalable and cost-effective global voice solutions.
  • Global virtual numbers: With access to virtual phone numbers in over 150 countries, AVOXI enables businesses to establish a local presence without physical offices.
  • Advanced IVR: AVOXI’s IVR systems enhance customer experience by efficiently directing calls.
  • Intelligent call routing: AVOXI's call routing feature guarantees that customers reach the appropriate departments, which improves customer satisfaction and operational efficiency.

Cost benefits with AVOXI

By taking advantage of AVOXI's solutions, enterprises can reduce total communication costs through:

  • Lower infrastructure expenses: Cloud-based services eliminate the need for extensive on-premises equipment.
  • Reduced international calling costs: Local virtual numbers and optimized routing lower global communication expenses.

Incorporating AVOXI's cloud communications solutions into your software asset management (SAM) process can significantly improve operational efficiency and reduce costs. By using a unified virtual phone system, businesses can improve customer interactions, scale services effectively, and boost productivity through automation tools.

How to implement UCaaS and AVOXI

Implementing UCaaS and AVOXI can transform your business communications, making them more efficient and cost-effective. Here's a step-by-step guide to help you through the process:

Step 1: Assess your current UCaaS needs and limitations

Begin by evaluating your existing communication infrastructure to identify areas for improvement. Consider the following common UCaaS limitations AVOXI can address:

  • Global call quality and international calling costs: AVOXI's cloud-based services eliminate the need for extensive on-premises equipment, which reduces infrastructure expenses.
  • Intelligent call routing for enhanced customer service: Customers may experience delays or misdirection without advanced routing, impacting their satisfaction. Fortunately, AVOXI's intelligent call routing enables callers to reach the right agents promptly, improving response times and customer experience.
  • Virtual numbers for international call centers: Expanding your business globally often requires a local presence. AVOXI offers virtual numbers in over 150 countries, allowing businesses to offer customers a familiar, local way to connect—no matter their location.
  • Integrations with existing business applications: Seamless communication between tools is vital. AVOXI integrates with popular CRM platforms like Salesforce, HubSpot, and Zoho to deliver smooth workflows across platforms.

Step 2: Set up an integration roadmap

After identifying your needs, create a detailed integration plan like this one:

  • Define objectives: Clearly outline what you aim to achieve with UCaaS and AVOXI, such as cost reduction, improved call quality, or enhanced customer service.
  • Determine a timeline and milestones: Establish a realistic timeline with key milestones to track your progress.
  • Designate company resources: Assign dedicated teams or individuals responsible for various integration aspects.
  • Develop a risk management plan: Identify potential challenges and design contingency plans.

Step 3: Test the integration

Before a full-scale rollout, conduct a pilot test to ensure everything works as expected. Here’s how to do it:

  • Select test groups: Choose specific departments or locations for participation in the pilot test.
  • Monitor performance: Track call quality, system reliability, and user feedback during testing.
  • Adjust accordingly: Address any issues and refine the system for optimal performance.

Step 4: Optimize and scale

If the pilot test is successful, you can proceed to full implementation:

  • Training: Instruct your staff on how to use the new UCaaS system effectively.
  • Continuous monitoring: Regularly assess system performance and user satisfaction.
  • Scalability: Use AVOXI's scalable solutions to accommodate business growth and evolving communication needs.

By following these steps and using AVOXI's features, you can seamlessly integrate a UCaaS system into your operations and improve global communication efficiency while effectively managing software costs.

Improve your communication strategy with AVOXI

Now you know how the right UCaaS provider can transform enterprise communications—and how you can enhance UCaaS solutions to bridge any communication gaps. Building a robust communication strategy that bridges these gaps requires businesses to carefully consider factors like pricing, TCO, security, and compliance.

Remember, scalability and global reliability are non-negotiable for growing enterprises. Often, the final piece of the puzzle is guaranteeing that your global voice infrastructure matches the power of your internal collaboration tools.

AVOXI completes the puzzle by delivering essential global voice capabilities that enhance your existing UCaaS setup.

Want to bridge the gaps in your global communication strategy and ensure seamless, reliable, and cost-effective connectivity? —Learn more today about how AVOXI can enhance your UCaaS solution with global cloud communications voice capabilities.

Commonly Asked UCaaS Questions

Let's address some common questions about UCaaS and related technologies:

UCaaS is a cloud-based delivery model that integrates various communication tools—such as voice, video, messaging, and collaboration—into a single platform. It allows businesses to access and manage these tools over the internet, eliminating the need for on-premises hardware.