AI voice agents are totally transforming the way call centers operate today.
They can handle both inbound and outbound calls automatically, resolve issues end-to-end – often without human intervention – and they sound almost like a real human.
More importantly, since a call handled by a human can cost between $7 and $12, while an AI-handled call is only about 40 cents, AI voice agents can deliver major cost savings for call centers.
In this article, we’ll overview the 6 best voice AI agents for call centers to help you choose one that best aligns with your needs.
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AI voice agents are contact center AI tools that can automatically handle voice interactions through technologies like Automatic Speech Recognition (ASR), Natural Language Processing (NLP), Large Language Models (LLMs), Natural Language Generation (NLG), and Text-to-Speech (TTS),among others.
AI voice agents are sometimes referred to as an AI voice bot, an AI phone agent, a virtual call center agent, or even an AI-powered voice assistant.
Regardless of the terminology, these AI call center solutions are being widely adopted now across industries.
No wonder the global voice AI agents market size is expected to be worth around USD 47.5 billion by 2034, growing from USD 2.4 billion in2024, according to research from Market.us.
Here's a breakdown of some of the most common and impactful AI voice agent use cases in call centers:
● 24/7 service and support: AI voice bots for customer service can answer FAQs about products and services, provide relevant information, and handle common customer inquiries like billing questions, order status, password resets, or troubleshooting simple issues – all while operating24/7.
● Appointment management: AI voice agents can handle the entire process of booking, rescheduling, or canceling appointments in real-time by integrating with a company's calendar or scheduling system. Plus, they can send automated reminders, reducing no-shows, which is a game-changer for service-based businesses.
● Lead capture and qualification: AI voice agents are also extensively used for lead capture and qualification. They can answer inbound calls, collect lead details, and qualify prospects on predefined criteria (interest, needs, budget). Once the lead is qualified, the AI voice agent can instantly book a demo or transfer the call to a human sales rep.
● Cold calling automation: AI voice bots can handle large-scale outbound cold calling campaigns, introducing products or services, delivering a pitch, and asking qualifying questions. The best part is that an AI voice agent can make hundreds or thousands of calls per day, far exceeding the capacity of a human rep.
● Proactive campaigns and reminders: Businesses can use AI voice agents to automate proactive outbound campaigns. That may include payment reminders, policy renewal reminders, service and delivery updates, personalized offers based on customer purchase history, customer surveys, and other types of proactive campaigns.
VoiceSpin lets you build a low-latency AI voice agent that can automate customer support, appointment booking, lead qualification, proactive outbound campaigns, and more.
It integrates with CRM, calendar tools, and other back-end systems and can be instantly scaled to handle hundreds or thousands of simultaneous calls, making it an excellent solution for call centers managing high call volumes.
What’s distinctive about Voice Spin is that it actually offers a full-suite call center software with AI at its core, offering both traditional call center tools and AI-powered solutions, including AI voice agents, AI chatbots, AI predictive dialing, AI speech analytics, and omnichannel integration.
Key Features:
● Supports 100+ languages and dialects
● Handles interruptions intelligently
● Integrates with CRM and other back-end systems
● Provides AI speech analytics with custom reporting
● Can scale to handle unlimited concurrent calls
Vapi is a developer-focused platform for building AI voice agents that can handle customer support calls, appointment bookings, outbound sales calls, and more.
It is best suited for developers, AI consultants, and agencies.
Vapi can be scaled to handle thousands of calls at once, making it a highly scalable voice AI solution for large-volume call centers.
While it does require tech skills to get your AI voice agent up and running, Vapi offers a rich library of ready-made templates, so you don’t have to start from scratch.
What’s also great about Vapi is that it offers A/B testing tools, so you can easily test different variations of prompts, voices, and flows to see what works best.
Key Features:
● Offers an extensive library of pre-built agent templates
● Can handle interactions in 100+languages
● Provides A/B testing capabilities
● Offers out-of-the-box and custom integrations through APIs
● Allows bringing your own LLM or text-to-speech models
Similarly to Vapi, Bland AI is specifically built for developers – it gives you developer-level control over call flows, voices, and scripting.
With Bland AI, you can build a natural language voice bot for customer support automation, cold calling, follow-ups, lead qualification, and more.
Despite the technical depth, Bland AI offers well-structured docs, so teams with development experience can set up AI voice agents pretty quickly.
The solution is highly scalable, enabling you to automate thousands of calls per day.
What’s also interesting about Bland AI is that it allows you to create custom voices in any language, accent, or gender, or even clone a specific voice.
Key Features:
● Offers a drag-and-drop agent builder
● Supports multiple languages
● Offers natural-sounding voice synthesis and voice cloning
● Provides post-call analytics features
● Integrates with third-party apps and offers APIs
Lindy allows you to build an AI voice assistant for support or sales automation.
Lindy’s AI voice agent can handle customer support calls, appointment bookings, lead qualification, sales outreach campaigns, survey collection, and more.
With Lindy, you can build AI voice agents without deep technical expertise through an intuitive drag-and-drop builder.
In addition, it offers ready-made agent templates and an extensive library of help docs, so you can get started quickly.
Lindy integrates with third-party apps and lets you choose an LLM model when you need advanced reasoning skills.
It also offers a free trial so you can test basic features before committing to a paid subscription.
Key Features:
● Provides a drag-and-drop builder for non-tech users
● Offers 100+ pre-built templates
● Supports 50+ languages
● Integrates with CRMs and other third-party apps
● Provides enterprise-grade security and compliance features
Poly AI is a voice-first omnichannel platform specifically designed for automating inbound call handling and might not be suitable for outbound call automation.
It lets you build AI voice agents that can handle FAQs and customer service requests, manage orders, bookings, and reservations, process payments, collect customer feedback, and more.
The agent can be scaled to handle enterprise-grade conversation volumes across industries like healthcare, insurance, financial services, retail, telecom, travel, consumer services, and others.
Poly AI also offers an advanced call analytics module with custom metrics, so you can track what’s important to your business.
Key Features:
● Can handle conversations in 45+languages
● Includes real-time analytics with custom metrics
● Offers natural speech synthesis
● Includes enterprise-grade compliance and security features
● Provides out-of-the-box and custom integrations
Cognigy enables you to build enterprise-ready AI voice agents for handling high volumes of customer service interactions.
Its intuitive low-code AI flow editor allows you to easily build fallback logic, set escalation rules, and even design proactive outbound flows.
With Cognigy, you can scale your AI voice agent to handle tens of thousands of concurrent calls, making it an ideal option for enterprise-grade call centers.
Cognigy also offers an advanced analytics suite that lets you measure your AI voice agent’s performance, surface trends, and identify improvement opportunities.
Key Features:
● Offers on-premise, private cloud, or shared SaaS deployment options
● Provides a user-friendly visual conversation builder
● Can handle calls in 100+ languages
● Has integrations with major telephony providers and third-party apps
● Includes pre-built reports and analytics tools
Conversational AI for call centers isn't just the future – it's available today.
And as the use of AI in customer service and sales continues to grow, AI voice agents are becoming essential call center automation tools.
Implementing an AI voice agent can help you improve customer experience by delivering 24/7 support, automate many routine tasks like appointment scheduling and lead qualification, and ultimately reduce your operational costs by lowering the cost per call.
If you’re currently exploring AI voice agent providers, make sure to take a closer look at the solutions mentioned above.
