Top 8 AI Voice Agents for Customer Service in 2025

Here’s a number that should stop you in your tracks: 85% of callers won’t call back if their first attempt is missed. And every unanswered call? That’s part of the $126,000+ in lost revenue the average business faces each year.

Customer service is no longer just about being helpful—it’s about being fast, available, and consistent around the clock. AI voice agents are helping businesses meet those expectations head-on.

By 2025, AI is expected to handle up to 95% of customer interactions across voice and text. These virtual agents don’t just save time—they eliminate hold queues, reduce stress on your team, and offer support even when your office is closed.

And while digital tools like live chat and email continue to grow, one channel remains king: voice. A massive 88% of consumers still prefer resolving complex issues by phone.

That’s where AI voice agents step in. They greet callers, answer common questions, and even complete transactions—without a human ever picking up. No more missed calls. No more frustrated customers.

In this guide, we’ll walk you through the top 8 AI voice agent platforms to know in 2025. You’ll get a breakdown of features, best use cases, and what sets each one apart—so you can find the right fit for your business and your customers.

What Is an AI Voice Agent?

An AI voice agent is an intelligent virtual assistant that can talk to customers over the phone and help resolve their issues, much like a human representative.

It uses advanced technologies – including automatic speech recognition (to understand spoken words) and natural language processing (to interpret meaning) – to engage in two-way conversations with callers. 

In practice, an AI voice agent can answer inbound calls and make outbound calls on behalf of your business without human intervention, handling dialogues from the initial “hello” to issue resolution. If it reaches a question or request it can’t handle, the voice agent will seamlessly transfer the call to a human agent when needed.

In other words, these voice agents go beyond old-school IVR systems that forced callers to press buttons or follow rigid scripts. Instead of navigating a touch-tone menu, customers can simply speak naturally to the AI.

Modern AI voice agents can handle a wide range of tasks: answering FAQs, providing account information, scheduling appointments, processing simple orders or payments, and even troubleshooting common issues. 

Popular consumer examples include virtual assistants like Apple’s Siri or Amazon’s Alexa that carry on human-like dialogues. In the customer service realm, more specialized voice agents are designed to serve as virtual call center agents, taking over routine calls and repetitive queries from live staff.

Behind the scenes, AI voice agents are powered by machine learning models that enable them to recognize intent and context. Many use large language models (LLMs) and are trained on vast datasets (including your company’s knowledge base or past call transcripts) so they can provide accurate, relevant answers.

The result is a phone conversation that feels like talking to a knowledgeable assistant who’s always available. In summary, an AI voice agent is a digital customer service rep that answers calls autonomously, handles inquiries in a human-like manner, and frees up your human team for more complex or sensitive calls.

Benefits of AI Voice Agents in Customer Service

Why are so many companies investing in AI voice agents? The benefits extend to both businesses and customers:

• 24/7 Availability with No Wait Times 

An AI voice agent can answer calls instantly at any time, day or night. This ensures customers get help even outside of normal business hours—crucial when 32% of calls in some industries come after hours.

There’s no hold music or queue; every caller gets an immediate response. In fact, over 60% of consumers would rather talk to a bot immediately than wait 15 minutes for a human.

• Consistent, Lightning-Fast Service

AI agents don’t have “off days” – they provide the same level of service to every caller. They can handle multiple calls in parallel, never get tired, and respond in milliseconds. This leads to quicker resolutions for common issues.

Routine requests (balance inquiries, order status updates, appointment bookings, etc.) can be resolved on the first call without needing escalation. Faster help means happier customers. Businesses implementing AI voice and chat agents have seen customer service resolution times drop significantly (up to 44% faster issue resolution in some cases) and higher satisfaction as a result.

• Reduced Costs and Scalability

By offloading repetitive calls to AI, companies can dramatically cut support costs. There’s no need to hire extra agents for handling spikes in call volume or after-hours coverage. Gartner estimates that by 2026, conversational AI will save organizations about $80 billion in contact center labor costs.

One AI voice agent can often handle the workload of several human agents for Level-1 queries, allowing your team to scale support without a matching rise in headcount or budget. AI agents also help avoid revenue loss from missed calls – every call answered could be a sale or a saved customer.

When paired with cloud contact center software, one AI voice agent can often handle the workload of several human agents for Level-1 queries. This enables your team to scale support without a matching rise in headcount or budget. AI agents also help avoid revenue loss from missed calls – every call answered could be a sale or a saved customer.

• Higher Call Capacity & No Missed Leads

Unlike humans, who can take only one call at a time, AI voice agents can handle many calls simultaneously. This is ideal for businesses that get bursts of calls.

The AI will cheerfully answer each one in turn. This flexibility means no caller hears a busy tone or goes to voicemail. Given that 85% of people won’t call back if their first attempt goes unanswered, having an AI agent pick up every call on the first ring ensures you’re not losing customers due to unavailability.

• Improved Customer Experience

Modern voice agents deliver a far better experience than the old “robotic” phone systems. They can converse naturally, recognize caller intent without the customer having to precisely phrase things, and even detect sentiment or tone. 

The best AI voice platforms allow you to customize the agent’s voice and personality to align with your brand – so it can be warm, friendly, and helpful, not monotone or canned. Customers get instant answers to many issues, and if the AI can’t help, it smoothly escalates to a human with context (warm transfers).

This blend of speedy self-service and smart handoff can boost metrics like First Call Resolution and CSAT. As a result, companies using voice AI report higher customer satisfaction and loyalty. 

• Boosted Productivity and Sharper Strategy

From your support team’s perspective, AI voice agents are like tireless assistants handling the easy stuff. They can deflect a huge volume of simple Tier-1 calls. 

This drastically reduces the inbound workload for human agents, who then can spend more time on complex or high-value customer calls that truly need a human touch. Agents are less overwhelmed and can be more effective where they’re needed.

In turn, this can improve your team’s morale and performance. Managers can also use AI call transcripts and analytics (since these platforms log every interaction) to gain insights and coach their teams, further improving service quality.

In short, AI voice agents bring a combination of cost savings, efficiency, and customer satisfaction improvements. They let you offer always-on phone support and capture every customer inquiry, while streamlining your operations. Now, let’s look at the top AI voice agent solutions in 2025 that are leading this revolution in customer service.

Top 8 AI Voice Agents for Customer Service in 2025

The market for AI voice agents has exploded, with many companies offering different approaches to automated phone support. Here we’ve compiled eight of the best AI voice agent platforms.

1. CloudTalk – AI Voice Agent for SMBs with 24/7 Coverage and CRM Integration

• CloudTalk is the leading global AI business calling software for growing SMBs, offering unparalleled call quality and country coverage. Over 4,000 modern SMBs rely on CloudTalk’s crystal-clear call quality in over 160 countries, seamless integration with existing systems, and AI-powered analytics to have MORE and BETTER calls.
• CloudTalk offers an AI Voice Agent to automate customer calls, making it an excellent all-in-one choice for small to mid-sized companies (3 to 250+ agents) looking to add AI call handling without switching systems.
• CloudTalk’s AI voice agent is built to handle inbound calls 24/7, ensuring your customers always reach a helpful “representative” even outside normal office hours.
• Common use cases include answering FAQs, walking customers through basic troubleshooting steps, calling and qualifying leads, and following up on routine calls like appointment confirmations or payment reminders.
• On top of that, CloudTalk’s AI Conversation Intelligence can cut live agents’ workloads on analysis by up to 80%. In turn, your human staff can focus on complex or high-value calls without worrying about missing the simple ones.
• One standout feature of CloudTalk’s solution is how seamlessly it integrates with your existing workflows. CloudTalk connects with 100+ CRM and helpdesk tools (like HubSpot, Salesforce, Zendesk, etc.), so the AI agent can log call details and update records just like a real agent would.
• CloudTalk also provides an easy drag-and-drop workflow designer so you can customize the call flows without coding. You can define how the AI should respond to certain questions, what information to collect, and when to hand off to a person. This makes deploying an AI voice agent very accessible even for teams without developers.
• When it comes to call quality and reliability, CloudTalk delivers crystal-clear audio and 99.99% uptime in over 160 countries. Your AI agent can thus call customers in New York to New Delhi on a familiar local number, increasing answer rates and trust.
• From a cost perspective, CloudTalk operates on a per-user subscription model with affordable plans for SMBs (and the AI features available as add-ons). Its AI Voice Agent is priced at €0.25 / min.
• Overall, CloudTalk is an ideal choice if you want a balanced, user-friendly platform that combines a robust cloud phone system with the latest AI voice capabilities – all tailored to the needs (and budgets) of growing businesses.

2. Voiceflow – No-Code Platform for Designing Custom Voice & Chat Agents

• If you’re looking to build your own conversational AI agent with a high degree of customization, Voiceflow is a leading platform to consider. Voiceflow isn’t a ready-made voice bot that you plug in; rather, it’s a powerful no-code development tool that lets you design, prototype, and deploy AI voice agents (as well as chatbots) to suit your specific needs.
• Think of it as the Canva or Figma of conversational AI – used by product teams and conversation designers to create voice apps without writing code. Voiceflow has been around since the days of Alexa skills and has evolved into an enterprise-grade conversation design platform that supports AI agents for customer service, voice assistants, IVRs, and more.
• With Voiceflow, you can visually map out the dialog flows and logic of your AI voice agent using a drag-and-drop interface. You add intents, sample phrases, questions to ask the user, and actions (like calling an API or looking up a database) as blocks in the flow. 
• The platform supports integration of large language models (like GPT-4 or other AI engines) as well as your own business rules. This means you can create very dynamic voice agents – for example, an agent that guides a customer through a troubleshooting process, where the next question depends on the user’s last answer, or a multilingual customer service bot that switches language based on the caller.
• For customer service scenarios, Voiceflow allows integration with your backend systems. You can connect the voice agent to CRM data, inventory databases, scheduling systems, etc., via API steps in the conversation flow. This lets your AI agent perform complex tasks like checking order status, updating an address, or booking a return, all within the call. 
• One of the key benefits of Voiceflow is that it’s channel-agnostic. You can design a conversation once and deploy it across voice and text channels: phone, Alexa/Google Assistant, web chat, SMS, etc. For voice deployments, Voiceflow can integrate with telephony providers or platforms like Alexa. 
• This is great if you already have a telephony setup and just need the AI logic layer. On the other hand, it means Voiceflow is a bit more DIY – you might need a developer or IT person to hook up the phone lines and APIs, whereas some other options on this list are more turnkey.
• Pricing-wise, Voiceflow offers a free tier for small projects and paid plans that scale with usage and collaboration features – making it accessible to startups and big companies alike. If your company wants full control over the voice agent’s behavior and the ability to innovate unique conversational experiences, Voiceflow is a good choice. It’s like having a toolkit to craft a bespoke AI voice agent that perfectly fits your brand’s personality and your customers’ needs.

3. VoAgents – Specialized Voice AI for Call Automation Across Industries

• VoAgents is a newer entrant focused specifically on AI voice agents for business calls. Their platform provides “plug-and-play” intelligent voice agents that can automate both inbound and outbound phone calls.
• VoAgents stands out for its industry-specific solutions. Instead of you building a voice bot from scratch, VoAgents offers pre-trained agents (with names like “Alexander” for dental offices or “Eva” for customer support) that already know how to handle common scenarios in that domain.
• Under the hood, VoAgents uses a mix of advanced NLP and possibly GPT-based models to understand open-ended speech. They advertise that their agents “speak, listen, schedule, and follow up — 24/7”, which nicely summarizes the capabilities: they can carry on a conversation, update calendars or CRM (e.g. scheduling a meeting), and even initiate follow-ups like calling a customer back with an update.
• A big focus of VoAgents is on increasing conversions and efficiency. Their tagline “Turn Every Call Into a Conversion” suggests that the AI is not just an FAQ bot, but can be tuned to drive outcomes (like capturing a lead or closing a sale) on the call.
• For outbound use, imagine an AI agent calling leads from a list to offer a product or collect feedback – VoAgents can do that at scale, with each AI agent making calls simultaneously. For inbound, they highlight reducing wait times and making sure customers get immediate service. The platform supports call transfers to humans when needed (and even chaining multiple AI agents together during one call if that helped, though a more unique idea).
• From a technical standpoint, VoAgents provides a full stack: an AI engine plus a phone system interface and a dashboard to manage your agents. They mention features like uploading your knowledge base documents so the agent can answer from them, integrating external tools and APIs for realtime info, and even doing “counterfactual analysis”.
• VoAgents is likely a subscription service, possibly with usage-based pricing (they have a Get Started and Talk to Sales approach on the site). It’s well-suited for companies that want rapid deployment of voice AI in a specific business area without the heavy lifting of building from ground zero.
• In summary, VoAgents offers ready-to-use AI voice agents with industry know-how, enabling businesses to automate calls and boost productivity with minimal development effort.

4. Plivo – API-Based Voice AI Platform with Real-Time Performance

• Plivo is known in the communications world as a cloud API platform (CPaaS) for voice and SMS – much like Twilio. In recent years, Plivo has introduced AI Voice Agent capabilities on top of its platform, making it a strong choice for developers and businesses that want maximum control and integration of AI into their voice workflows. With Plivo, you’re essentially adding AI brains to a proven global telephony infrastructure.
• What sets Plivo’s AI voice solution apart is its emphasis on real-time, low-latency conversations and flexibility in AI models. According to Plivo, their voice API can achieve latency under 30 milliseconds for responses – meaning the AI agent can respond almost instantly after a caller stops speaking, keeping the dialog flow natural and fast.
• Plivo’s voice agents also run on a network with 99.99% uptime and global coverage, ensuring reliable call quality (an area Plivo has long experience in). In short, Plivo leverages its telephony backbone to give AI voice bots a strong, uninterrupted voice channel.
• On the AI side, Plivo offers a bring-your-own-AI approach: you can choose your preferred speech recognition and language models. For instance, you might use OpenAI’s GPT for language understanding, Deepgram for speech-to-text, and Amazon Polly or ElevenLabs for text-to-speech.
• This modularity is great for companies that have specific AI engines they trust or proprietary models they want to deploy. Plivo essentially handles the orchestration of the call and leaves the AI logic to whatever model you connect. They also support training custom voice agents on your own data (knowledge bases, FAQs, etc.) to personalize how it converse.
• Pricing for Plivo voice agents is usage-based, similar to their telephony pricing. The Plivo blog cites a cost of $0.003 per minute per voice stream for their AI voice agent service, which is quite competitive (they note other providers charge around $0.005 per minute or more). This pay-as-you-go model can be cost-efficient for scale and avoids big upfront fees – you pay for the minutes your AI is actually conversing. It also easily scales up or down with your call volumes.

5. Cognigy – Enterprise Conversational AI Platform for Omnichannel (Voice + Chat)

• Cognigy is a well-established player in the conversational AI space, particularly known for serving large enterprises with complex needs. Cognigy’s platform enables companies to build AI-powered virtual agents for both voice and chat, with a strong focus on enterprise integration, security, and omnichannel experiences.
• One of Cognigy’s hallmarks is its powerful natural language understanding (NLU) engine and dialog management capabilities. It can handle sophisticated conversation flows, multiple intents in one sentence, and transactions that involve back-and-forth dialogue.
• For voice specifically, Cognigy offers a Voice Gateway that connects the AI to telephony systems, enabling deployment of voice bots in call centers. Many large companies have used Cognigy to create AI voice agents for their hotlines.
• Integration is a big strength: Cognigy can tie into CRM systems, databases, RPA (robotic process automation) bots, and even legacy IVR menus. This means an AI voice agent built with Cognigy can seamlessly pull up customer info, execute transactions, or trigger workflows during a call, just like a live agent accessing multiple systems. 
• Moreover, Cognigy allows deploying the same AI agent across channels – so your “virtual agent” could answer on the phone, on your website chat, and on messaging apps, providing a consistent experience. For companies aiming for true omnichannel customer service, this is ideal. A customer could start with the AI on chat, then call in and the AI (or the integrated context) continues, etc., since it’s the same brain behind all channels.
• In terms of usability, Cognigy provides a graphical conversation editor somewhat like Voiceflow’s, but with more enterprise-grade features (versioning, testing tools, analytics dashboards). It also supports multilingual bots out of the box, which is important for global enterprises.
• The “brains” of Cognigy.AI are notable too – they have a hybrid approach that can use both machine learning and rule-based flows, plus recently they’ve integrated generative AI capabilities (so it can leverage large language models for some responses, but within guardrails). This allows for very human-like interactions while still letting companies retain control over critical parts of the conversation (so the AI doesn’t go off-script when it shouldn’t).
• Cognigy is typically a premium solution – pricing is custom (likely a license or subscription based on usage and number of agents). It’s geared towards organizations handling huge volumes of interactions (millions of calls/chats) and aiming to automate a big percentage of them. In summary, Cognigy offers enterprise-level AI voice agents that can carry out sophisticated conversations, connect with myriad systems, and operate at scale across channels – all while you maintain control and compliance.

6. Verloop.io – Voice AI Call Solution with Rapid Deployment for Customer Support

• Verloop.io is a conversational AI platform that originated in customer support automation (especially in chatbot solutions) and has now expanded into Voice AI for call centers. Their Voice AI Call Solution is a plug-and-play product aimed at companies that want to quickly add an AI front-line to their phone support without a huge development project.
• What Verloop.io offers is a full-stack voice AI system: speech recognition, NLU, and a telephony connector – all optimized by them for high performance in real-world call scenarios. They emphasize that their speech recognition (ASR) is trained on 1,000+ hours of call data and can handle different accents, background noise, and even filler words smoothly.
• On top of ASR, their NLU engine is specialized for support conversations and even does sentiment analysis and intent recognition to detect what the customer wants and how they’re feeling. For instance, if a caller sounds upset or says something in an angry tone, the system might prioritize escalating to a human faster.
• Verloop.io markets their solution as “gen AI-powered”, incorporating large language models for natural dialogue generation. This means their voice agent can understand complex queries and respond in a human-like way beyond simple scripted answers. Yet they also allow predefined flows and multi-step conversations for structured processes (like verifying identity, then processing a request).
• Importantly, Verloop.io’s voice AI can be dropped into your existing phone systems – it’s deployable on popular cloud telephony, IVR, ACD, or PBX setups. They even mention you can lease a phone line from them for quick setup, which lowers the barrier to trying it out. Essentially, if you have a support number, you can integrate Verloop.io’s AI at the front so it answers calls first, and then either handles the issue or transfers to agents when needed.
• They claim it can securely automate 80%+ of support and sales inquiries, handing off only the complicated ones to human agents. And when it does hand off, it provides a summary to the human agent so the caller doesn’t repeat themselves.
• One of Verloop.io’s selling points is speed of deployment. They position their solution as ready to go with minimal customization. Their platform also integrates with 100+ tools, so it can log interactions into your CRM or ticketing system easily.
• Verloop.io is likely offered as a SaaS subscription, tailored to enterprise clients (so pricing would depend on the number of calls, etc.). If your goal is to quickly add a proven voice bot to your support center, Verloop.io is a strong contender. It’s essentially giving you an AI voice assistant on call that can vastly improve your call response capacity and consistency.

7. WorkHub WorkBot – Unified AI Agent for Chat and Voice with Human Handoff

• WorkHub WorkBot is an AI platform that provides multichannel AI agents for customer support and sales, combining both chatbots and voice bots in one solution. Aimed at startups and growing businesses, WorkBot positions itself as a way to automate customer interactions across channels while keeping things easy to manage in a single interface. 
• WorkHub emphasizes rapid deployment: you can configure an AI agent by giving it a name, connecting data sources (like your knowledge base or website content), and it’s ready to start handling conversations on multiple channels. For voice, WorkBot offers an AI voice agent that connects to your phone system and answers calls just like the chat version would on your site.
• WorkBot includes nice-to-have features like sentiment analysis, which gauges if a customer is happy or frustrated during the interaction. It also has a human fallback built in – meaning if the AI reaches its limit or the user asks for a human, WorkBot will smoothly hand off the conversation to a live agent.
• Another strength of WorkHub WorkBot is its centralized knowledge management – it pulls answers from connected sources and creates a unified “brain” for all your AI agents. You don’t have to maintain separate FAQs for chat vs voice; the AI taps the same knowledge and business logic everywhere. They also tout integrations with tools like Shopify (for e-commerce queries), calendars (for booking appointments), and others to let the AI actually perform tasks during conversations.
• WorkBot is geared to be flexible for different team sizes. It offers a Free plan (great for trying out on a small scale) and paid plans for more usage and features. Users particularly praise its ease of setup and the quality of its AI responses, which feel tailored and context-aware, thanks to training on the company’s own data.
• In summary, WorkHub WorkBot is an excellent choice for companies that want a one-stop-shop AI agent covering multiple channels, including voice. It offers fast deployment, ease of use, and strong out-of-the-box capabilities like sentiment detection and integrations, making advanced AI accessible even to teams that don’t have a big IT department.

8. Forethought – “Agentic” AI Voice Agent for Fully Resolved Phone Inquiries

• Rounding out our list is Forethought, a cutting-edge AI company offering an AI Voice Agent as part of its customer support automation suite. Forethought is known for its “agentic AI” approach – meaning their AI agents are designed to truly resolve issues end-to-end, not just deflect or assist. Forethought’s voice solution, often referred to as Forethought Voice, is built to answer customer calls and handle the conversation from the initial greeting all the way to solving the customer’s problem, whenever possible.
• Forethought’s AI Voice Agent distinguishes itself by removing the common pain points of phone support. There are no IVR menus or hold music – callers get to speak their issue in natural language from the start, and the AI responds intelligently. 
• Under the hood, Forethought’s platform uses advanced AI reasoning (their Autoflow engine) and is deeply integrated with support systems. For example, if a customer calls about an order issue, Forethought Voice can tap into your CRM or order management system (via its integrations with tools like Zendesk, Salesforce, etc.) to pull up the relevant info and answer the query. 
• If the customer wants to escalate to a human agent, Forethought will transfer the call and pass along the conversation history and context directly into the helpdesk, so the live agent immediately sees what the customer’s issue is and what’s been done so far. This seamless integration means the AI voice agent is a part of your whole support ecosystem.
• Their approach to AI is notably “human-centered”: they train the AI on your historical support data (like past call transcripts and resolutions) so it learns the best answers and procedures from real cases. Over time it can even surface insights such as knowledge gaps or new issues trending, helping you improve your support content.
• In terms of pricing, Forethought likely operates on a custom SaaS model for mid-to-large enterprises. It’s an enterprise-grade solution offering a lot of sophistication, which might be more than a small business needs, but for a busy contact center, it can be transformative. 
• If you want an AI voice agent that strives to truly solve customer issues on calls just like a top-notch human agent would (only faster), Forethought is a nice pick. It combines cutting-edge conversational AI with deep integration to your support stack, aiming for what we all want: no more frustrating phone experiences, just quick and effective service. 

Conclusion: Empower Your Customer Service with AI Voice Agents

AI voice agents are no longer just hype – they’re delivering tangible value by helping businesses answer every call, delight every customer, and do it all more efficiently. Whether you’re a small business struggling with after-hours calls, or an enterprise aiming to handle millions of support queries, there’s an AI voice solution out there to fit your needs. 

The eight platforms we covered showcase the range of options: from CloudTalk’s all-in-one AI phone system for SMBs, to Forethought’s advanced problem-solving agent for large support teams, and everything in between. By implementing a voice AI agent, you can provide instant, 24/7 assistance to your callers, cut down on wait times and missed calls, and free your human agents to focus on high-value interactions. The result? Happier customers, lower costs, and a more scalable customer service operation.

As you consider which AI voice agent to choose, think about your specific goals – do you need something plug-and-play or highly customizable? Is deep CRM integration key? What call volumes and languages must it handle? The solutions above cover a broad spectrum, so you can likely find a perfect match.

One thing is clear: AI voice agents are here to stay and are quickly becoming standard in customer service. Adopting this technology now can give you a competitive edge in responsiveness and availability. Why not let an AI agent handle the repetitive calls so your team can focus on the conversations that truly need a human touch? It’s a win-win for your business and your customers.

If you’re ready to elevate your phone support to the next level, consider CloudTalk’s AI Voice Agent – an easy, powerful way to start automating your customer calls. CloudTalk combines a top-rated cloud phone system with 24/7 AI assistance, so you never miss a beat. Book a demo with CloudTalk today and see how AI voice agents can transform your customer experience, one call at a time.