As AI calls become the standard for handling routine and complex customer interactions, AI voice agents are proving critical in reducing wait times and scaling operations without scaling headcount, but not every contact center vendor can deliver on these promises. With the market crowded and evolving, this guide cuts through the noise to highlight the top contact center vendors for enterprises looking to deploy the ideal voice agent that can handle AI calls at scale.
The numbers tell a compelling story. According to Gartner, agentic AI will autonomously resolve 80% of common customer service issues by 2029, reducing operational costs by 30% [1]. This is happening now, with 85% of customer service leaders already planning to explore or pilot conversational GenAI solutions this year [2].
The market reflects this urgency: AI agents are projected to grow from $3.7B in 2023 to a staggering $103.6B by 2032 [3]. For enterprises struggling with staffing shortages and rising labor costs, AI voice agents offer a timely solution that enable 24/7 coverage without the traditional overhead while delivering ROI within 90 days for most well executed enterprise deployments.
Evaluating enterprise AI requires a strategic framework that aligns with your business priorities. Unlike siloed solutions that address only specific problems, enterprise-grade voice agents must meet comprehensive standards that satisfy CX objectives, IT requirements, and compliance considerations simultaneously.
Here's what separates enterprise-grade solutions from the rest:
A CX directors biggest worry with AI voice agents is whether they can manage complex customer interactions without sounding robotic. Today's leading solutions don't just follow scripts they understand context, manage interruptions, and maintain conversation flow naturally.
The best contact center vendors will have an ecosystem of conversational capabilities like backchanneling, voice cloning, complex conversation flow, and sophisticated turn taking model.
Focused and expansive integration isn't optional, seamless connections with existing CRM systems like Salesforce and Zendesk are among the top requirements for enterprise buyers. Look for pre-built connectors, robust API options, and webhooks.
With voice cloning attacks now threatening contact centers [4], enterprise-grade security is non-negotiable. Evaluation criteria should include:
Downtime isn't just inconvenient, it's costly. Leading platforms now offer 99.99% uptime guarantees with seamless fallbacks across LLM and TTS providers [6] to ensure business continuity even during outages.
Core Strengths: Enterprise-ready voice agents with 99.99% uptime and highly secure and scalable infrastructure.
Key Differentiators:
Best For: Large enterprises requiring carrier-grade reliability and deep integrations.
Customer Impact: Enterprise deployments with Retell AI have achieved 80% reduction in call handling costs in healthcare environments and 85% containment rates in contact center use cases, with up to 90 NPS on customer interactions [5].
Core Strengths: Established contact center provider with AI voice capabilities built on their existing platform.
Key Differentiators:
Best For: Current Five9 customers looking to add AI voice capabilities.
Core Strengths: Purpose-built for customer service automation with industry-specific solutions.
Key Differentiators:
Best For: Mid-size enterprises with defined use cases in supported industries.
Core Strengths: Advanced natural language capabilities backed by Google's AI infrastructure.
Key Differentiators:
Best For: Data-driven organizations already using Google Cloud.
Core Strengths: Enterprise-grade solution with strong security and compliance features.
Key Differentiators:
Best For: Security-conscious enterprises, particularly in regulated industries.
Core Strengths: Scalable, pay-as-you-go model with tight AWS integration.
Key Differentiators:
Best For: AWS-centric organizations with variable call volumes.
Core Strengths: Healthcare-focused voice solution with deep domain expertise.
Key Differentiators:
Best For: Healthcare organizations requiring specialized compliance and terminology.
Core Strengths: Comprehensive WFO and analytics with AI voice capabilities.
Key Differentiators:
Best For: Organizations prioritizing quality management and agent coaching.
Core Strengths: Established omnichannel platform with integrated AI capabilities.
Key Differentiators:
Best For: Organizations requiring sophisticated omnichannel journeys.
Core Strengths: Highly programmable platform with granular control.
Key Differentiators:
Best For: Organizations with strong development resources requiring customized solutions.
Understanding the financial impact of AI voice agents requires looking past the initial purchase to consider the complete lifecycle costs and benefits. While feature comparisons matter, the true differentiator often lies in what most vendor comparisons miss: total cost of ownership (TCO).
Enterprises making strategic technology investments need a comprehensive view of both immediate expenditures and long-term value creation.
Some leaders believe that the initial investment and ongoing costs of AI voice agents are prohibitive for many enterprises." The reality is more nuanced. While upfront costs exist, leading solutions offset these with:
The most successful implementations don't "set and forget", they continuously optimize. Look for vendors offering:
When evaluating vendors, request a transparent ROI calculator that accounts for:
Enterprises implementing AI voice agents have documented operational cost reductions of 30-50% and CSAT increases of 25-40% within just three months [7]. The most competitive vendors can demonstrate ROI within 3-6 months, not years, with some deployments achieving approximately 380% ROI in voice-based customer service [8].
Successful AI voice agent deployments are built on strategic foundations that balance immediate wins with long-term vision. Rather than attempting to automate everything at once, forward-thinking enterprises are taking a measured approach that delivers quick victories while building toward comprehensive transformation.
The most successful deployments begin with:
These use cases can deliver immediate value, with data showing they can deflect up to 70% of Tier-1 support tickets [7], freeing human agents for more complex interactions.
Your AI voice agent isn't just functional, it's a brand ambassador. Evaluate:
For global operations, language support is critical. Evaluate both the number of supported languages and the natural, native-sounding quality in each.
Leading solutions now support many different languages with automatic language detection capabilities for primary languages, eliminating the need for separate conversation flows by language.
The evolution of AI voice agents represents a fundamental shift in how enterprises approach customer engagement and operational efficiency. We're witnessing the transition from simple task automation to sophisticated conversation partners capable of managing complex human interactions with nuance and intelligence.The trajectory is clear: AI voice agents are moving from handling simple queries to managing complex, multi-step interactions with human-like conversation skills. Key developments to watch:
By 2028, Gartner predicts that at least 15% of day-to-day work decisions will be made autonomously through agentic AI, up from 0% in 2024 [9], signaling the increasing role these systems will play in business operations beyond just customer service.
The ideal AI voice agent isn't necessarily the one with the most features, it's the one that best addresses your specific challenges while meeting enterprise requirements for security, reliability, and integration.
When evaluating vendors, prioritize:
The most successful implementations don't replace traditional cost centers, they transform the entire customer interaction model, creating experiences that weren't possible before.
AI voice agents represent more than cost savings, they offer a fundamental reimagining of customer interaction. The right solution doesn't just handle calls; it creates consistent, personalized experiences that strengthen customer relationships while reducing operational burden.
With 85% of customer service leaders exploring GenAI solutions this year [2] and businesses reporting 250% ROI on AI investments [10], the question isn't whether to implement AI voice agents, but how to select the right enterprise-ready solution.
See how Retell AI's enterprise voice agent platform fits into your contact center strategy. Explore our enterprise voice automation options and discover why leading organizations trust Retell for mission-critical voice interactions.
Try us out for free or book a demo to witness how our voice agents will transform your organization!
[1] CXToday. (2025). Gartner Predicts that Agentic AI Will Solve 80 Percent of Customer Problems by 2029.
[2] Gartner. (2025). Customer Service AI: 85% of Leaders to Explore GenAI Solutions by 2025.
[3] Plivo. (2025). AI Agents: Top Statistics You Need to Know in 2025.
[4] CXToday. (2025). Capacity Tackles Contact Center Voice Cloning Attacks.
[5] Open AI (2025). Retell AI makes voice agent automation customizable and code-free with GPT-4o
[6] Retell AI. (2025). How Retell AI Handles Outages with a 99.99% Uptime.
[7] Ambit Software. (2025). How Agentic AI Cuts Customer Service Costs & Improves CSAT.
[8] Teneo. (2025). Conversational AI ROI: Measuring Value Through KPIs.
[9] Gartner. (2025). Top 10 Strategic Technology Trends for 2025.
[10] Broadvoice. (2024). How AI is Transforming Contact Centers.
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