Best VOIP Call Center Software for 2025–2026: Top Picks and How They Compare

Are your agents spending more time dialing than actually talking to customers? Or are “Spam Likely” labels and dropped connections cutting into your conversion rates? The right VOIP call center software can change that.

Choosing the right solution determines how efficiently your team connects with prospects, manages leads, and delivers customer experiences that drive revenue. Unlike traditional phone systems that rely on costly PBX hardware and landlines, VOIP (Voice over Internet Protocol) technology routes calls over the internet—reducing overhead while enabling smarter, faster, and more flexible operations.

While most modern VOIP call centers are cloud-based, “VOIP” specifically refers to the internet-powered voice technology that makes those systems possible. This shift allows contact centers to scale quickly, support remote agents, and tap into advanced capabilities like predictive dialing, intelligent call routing, analytics, and CRM integrations.

Here’s why more businesses are moving to VOIP call centers:

• Cost efficiency: Eliminate expenses tied to physical phone lines, long-distance charges, and on-site maintenance.

• Scalability & flexibility: Add or remove agents and numbers instantly, whether your team is remote, hybrid, or global.

• Smarter features: Access built-in IVR, ACD routing, AI-assisted reporting, and auto-dialing tools once reserved for enterprise systems.

• Improved experiences: Faster routing, fewer dropped calls, and deeper visibility into team performance and lead outcomes.

In this guide, we review eight of the best VOIP call center platforms in 2025 and 2026. We place Convoso—a leader in outbound call center technology—at the top of the list and compare its strengths against other popular options, including Nextiva, RingCentral, Dialpad, and more. Along the way, we’ll highlight which software best fits different business goals, whether you’re scaling a sales operation or modernizing your customer support center.

Best VOIP call center software

The best VOIP call center platforms each bring something different to the table. Let’s dive into the top VOIP call center solutions and see how they compare on performance, features, and fit for different business needs.

Convoso (Outbound-focused)

Convoso is built specifically for outbound call centers that depend on high-volume dialing — sales, lead generation, collections, and performance marketing. Unlike broad contact center platforms, Convoso is engineered to help teams connect with more live leads, faster.

Strengths & Features:

• Predictive, power, and progressive dialing modes that maximize agent talk time and minimize idle time.

• Built-in lead management and intelligent routing to filter and prioritize leads automatically across campaigns.

• Real-time analytics, dynamic scripting, and call recording to improve performance and compliance oversight.

• Integrated compliance tools to help maintain TCPA, DNC, and STIR/SHAKEN adherence — including time zone management, consent tracking, and safe dialing rules.

• Easy integrations with major CRMs and APIs for workflow automation.

• Exclusive outbound optimizations such as Convoso Ignite™ (caller ID reputation management) and 97% accurate voicemail detection for maximizing contact rates.

• Rated higher than Five9 in ease of use (4.7/5) and value for money (4.6/5) on Capterra.

• The vendor itself publishes a detailed breakdown of why Convoso can outperform Five9 in outbound revenue efficiency.

Weaknesses & Considerations:

• Because its strength is in outbound, it may lack some of the more advanced inbound / omnichannel capabilities built into contact center platforms like RingCentral.

• Some features like workforce optimization or quality management might require add-on modules or external tools.

• For pure inbound-heavy customer support environments, alternatives with stronger inbound routing and omnichannel support may be more suitable.

Why Pick Convoso over Five9?

While Five9 is a well-known enterprise contact center platform, Convoso’s outbound tools like Ignite and its 97% voicemail detection make it a stronger fit for sales-driven teams.

If your business thrives on outbound calls, Convoso offers the combination of automation, dialing speed, and data-driven number management that most generic VOIP platforms can’t match. Some forums and review commentary suggest that Convoso’s support and onboarding process is more responsive when dialing volume scales, though these are anecdotal. 

Nextiva

Nextiva sits between unified communications (UCaaS) and contact center functionality, offering strong VOIP features plus call center capabilities.

Strengths & Features:

• Solid VOIP base: call recording, call queuing, IVR, automatic call distribution (ACD).

• Through acquisition of Thrio, Nextiva has bolstered its enterprise contact center capabilities (e.g., omnichannel, reporting).

• Smooth integration between internal phone and external call center functions.

• Good option for businesses needing unified voice + call center in one platform.

Weaknesses:

• May not match Convoso’s dialing throughput or outbound lead routing finesse.

• Some advanced features may come as higher-tier plans or add-ons.

• For organizations purely focused on outbound, Nextiva may feel too generalized.

Why pick Convoso over Nextiva?

If your operation is highly outbound-centric and you demand fine-grained dialing strategies, Convoso is often more specialized. Nextiva is a better “all-in-one” pick if you want to combine internal team communication with support channels and light outbound.

Ooma

Ooma offers an accessible VOIP system that appeals more to small- and mid-sized businesses. It is less of a full-blown contact center tool, but worth considering for lighter use cases.

Strengths & Features:

• Simple setup, lower cost, and basic call center add-ons (queues, ring groups).

• Good for small teams wanting to transition from legacy phones to VOIP.

• Solid reliability and support in its target market.

Weaknesses:

• Not built for high-volume dialing or complex campaign logic.

• Lacks many advanced features like predictive dialing, detailed analytics, or AI-driven insights.

• Integrations and scalability may be limited.

Why pick Convoso over Ooma?

If your business is scaling and expects heavy dialing, campaign routing, or advanced lead management, Convoso offers far more power. Ooma is better suited for relatively modest call volumes or simpler operations.

8x8

8x8 is a well-known cloud communications provider that offers call center capabilities alongside VOIP, messaging, and video.

Strengths & Features:

• True cloud-first platform with good international reach and reliability.

• Integrates voice, chat, video, and contact center features under one roof.

• Offers analytics, routing, and omnichannel support.

Weaknesses:

• Its outbound dialing capabilities (especially for high-volume campaigns) may not match Convoso’s specialization.

• Some advanced functionality (e.g., workforce optimization) may require higher tiers or add-ons.

• Cost can climb for advanced packages.

Why pick Convoso over 8x8?

If your priority is high-throughput outbound dialing, Convoso is more optimized. 8x8 is a stronger choice when you want convergence between internal communications and customer-facing channels in one unified suite.

Aircall

Aircall is a cloud-based phone system with a focus on simplicity, integrations, and modern usability. It’s widely used by sales and support teams. (Calilio)

Strengths & Features:

• Easy UI, rapid onboarding, seamless CRM integrations (HubSpot, Salesforce, etc.).

• Shared call inbox, call tagging, call recording, analytics and reporting.

• Good for remote or distributed teams due to its cloud-native design.

Weaknesses:

• May struggle at scale in high-volume outbound settings.

• Lacks advanced dialing modes like predictive or power modes.

• Enterprise-level features (e.g., advanced routing, QA, WFM) are limited or add-on.

Why pick Convoso over Aircall?

For companies focused on outbound campaigns and high agent throughput, Convoso’s dialing architecture is superior. Aircall is better suited for lighter call center usage or blended inbound/outbound support in smaller teams.

Dialpad

Dialpad is often praised for its AI capabilities (real-time transcription, coaching, insight) and modern interface.

Strengths & Features:

• Real-time call transcription, sentiment analysis, coaching suggestions.

• Unified voice + messaging + video in a modern UI.

• Good for teams valuing AI-driven guidance and insights.

Weaknesses:

• Dialing capabilities may be less configurable for aggressive outbound campaigns.

• As with many AI-first tools, advanced features may come in higher-tier plans.

• May require more fine-tuning to fit large-scale dialing operations.

Why pick Convoso over Dialpad?

When outbound dialing strategy, campaign routing, and lead conversion are top priority, Convoso’s specialization often wins. If your team places high value on AI insights, coaching, and real-time feedback in smaller or mixed-use environments, Dialpad is attractive.

CallHippo

CallHippo is often positioned as a budget-friendly, flexible VOIP and call center tool.

Strengths & Features:

• Transparent, lower-tier pricing.

• Core features like call forwarding, shared inbox, call recording, call analytics.

• Good for startups or small teams.

Weaknesses:

• Not built for large-scale outbound campaign dialing.

• Lacks advanced dialing strategies, call blending, or enterprise-level analytics.

• The ecosystem of integrations or advanced features is more limited.

Why pick Convoso over CallHippo?

If your business is growing and expects to scale dialing operations, Convoso is more robust and enterprise-ready. CallHippo is a reasonable stepping stone when cost is a major constraint, but may require migrating later.

RingCentral

RingCentral is widely recognized as a leader in unified communications and contact center platforms. Many reviews, such as those from TechRadar, list it among the top call center software tools in 2025.

Strengths & Features:

• Deep omnichannel support: voice, chat, SMS, social, email routing, etc.

• Extensive integrations, APIs, enterprise-grade routing, workforce optimization and analytics.

• Scalability to large enterprises with global reach.

• Consistently ranked as top-tier in reviews.

Weaknesses:

• For heavy outbound dialing, the dialing engine may not match Convoso’s optimizations out of the box.

• Advanced features often come with significant cost or higher-tier licensing.

• Complexity: setup and management may be heavier, especially for less mature teams.

Why pick Convoso over RingCentral?

If your call center is heavily outbound or sales-driven, Convoso gives you more direct control over dialing campaigns and lead flows. But if your business demands a broad, mature omnichannel system (voice + email + messaging + routing) and you’re comfortable with higher complexity, RingCentral may win on versatility.

Solving today’s biggest outbound challenge: low contact rates

Outbound teams everywhere are struggling with a drop in connect rates caused by spam and scam labeling on their caller IDs. Studies show that up to one in four business numbers may be mislabeled or blocked by carrier algorithms, while 94% of call center leaders say spam labeling has hurt their contact rates and revenue.

Convoso tackles this issue head-on with Convoso Ignite™, an AI-driven caller ID reputation management and DID lifecycle automation tool. Ignite continuously monitors number health,  automatically procures new DIDs, and intelligently selects the optimal number for every dial in real time.

Users report dramatic gains — up to 50% higher contact rates — after implementing Ignite. That’s a major advantage in an industry where even a few extra live connections per hour translate to thousands in recovered revenue.

Smarter voicemail detection for better agent efficiency

Another hidden drain on outbound efficiency and contact rates is wasted time connecting to voicemail. Convoso’s Answering Machine Detection (AMD) technology achieves up to 97% accuracy in identifying live answers versus voicemail or answering machines.

That precision lets the system drop automated voicemails or re-queue leads instantly — saving agents from talking to empty lines and increasing real human conversations throughout the day.

Which VOIP call center software is right for you?

All of these VOIP call center tools bring compelling capabilities to the table. Your ideal choice depends heavily on your use case:

• Outbound sales / lead conversion focus → Convoso often leads, thanks to its dialing sophistication and campaign-level control.

• Balanced inbound + outbound needs or unified communication → Nextiva, RingCentral, or 8x8 offer strong all-around platforms.

• Smaller teams or cost-sensitive setups → Aircall, CallHippo, or Ooma are more accessible entry points.

• AI-driven insights & coaching priority → Tools like Dialpad may shine.

If your priority is maximizing outbound agent talk time, customizing dialing rules, and scaling aggressive campaigns, Convoso is the solution you’re looking for. Book a demo to explore how Convoso’s predictive dialer, lead routing logic, and analytics can transform your revenue operations.

FAQ

1. What is VOIP call center software?

A VOIP call center uses Voice over Internet Protocol (VoIP) technology to manage calls over the internet instead of traditional phone lines. That shift makes modern call centers faster to deploy, easier to scale, and far less expensive to maintain. As businesses move away from legacy phone systems, VOIP call center software has become a key tool for improving flexibility, remote work, and operational efficiency.

2. What is VOIP call center software vs. a traditional call center system?

VOIP call center software routes voice calls over the internet rather than through legacy phone lines and on-premises hardware. This enables flexibility, remote agents, scaling, and integrated features like IVR, analytics, and softphones—capabilities that typical traditional systems often lack or require expensive add-ons.

3. Can I use my existing phone numbers with a VOIP call center?

Yes. Most VOIP platforms support number porting, allowing you to retain your local, toll-free, and business numbers. The porting process typically takes several days to a few weeks depending on region and carrier.

4. How reliable is VOIP for high-volume call centers?

Modern VOIP platforms deliver high reliability, often with SLAs of 99.9%+ uptime. The key is having sufficient network bandwidth, Quality of Service (QoS) configurations, redundant internet paths, and a provider with strong cloud infrastructure.

5. What features should I prioritize when choosing a VOIP call center solution?

Look for:

• Dialer modes (predictive, progressive, power)

• Campaign & lead management

• IVR / ACD routing

• AI-powered Caller ID reputation management

• Reporting & dashboards

• CRM / API integrations

• Omnichannel support (if applicable)

• Workforce management / QA

• Scalability & pricing flexibility

5. How much does VOIP call center software cost?

It varies. Entry-level plans may begin around $20–$50 per user per month, while enterprise systems with advanced features can run $100–$150+ per user per month. Add-ons (e.g., AI, analytics, WFM) often add to that base cost.

6. How difficult is it to migrate from legacy systems to VOIP?

Migration involves porting numbers, configuring network infrastructure, training, and possibly updating internal hardware. However, cloud-based providers typically guide the migration and simplify onboarding. For many businesses, the transition is manageable, and the benefits justify the effort.