AI Voice Agent Platform
The conversational AI engine behind Hailey
Phone Conversations That Actually Feel Like Conversations
Hailey's AI voice agent handles real phone calls with sub-second response latency, natural turn-taking, and live function calling, so it can check a calendar, look up an order, or transfer a call mid-conversation, not just read a script.
The same voice AI platform that powers Hailey's AI receptionist, available as its own engine.
Connects to your existing telephony in minutes via native carrier support or SIP trunking.
What is an AI voice agent?
An AI voice agent is a conversational AI system that can hold a real spoken conversation over the phone: understanding natural speech, responding with human-like turn-taking, and calling external functions like calendar lookups or CRM updates mid-call, rather than following a fixed decision tree like a traditional IVR. Hailey's voice agent platform combines low-latency speech recognition, a language model tuned for phone conversations, and natural-sounding voice synthesis into a single system built to run real business phone lines.
Built for real-time phone conversation
Most voice bots feel like voice bots: long pauses, no interruption handling, no memory of context. Hailey's voice agent is engineered specifically to avoid that.
Sub-Second Response Latency
Speech recognition, reasoning, and voice synthesis run in a tight pipeline so replies feel instant, not delayed.
Natural Turn-Taking
Handles interruptions and overlapping speech the way a real conversation does, instead of forcing callers to wait for a beep.
Live Function Calling
Checks a calendar, looks up a customer record, or updates a CRM mid-call. Real actions, not just spoken responses.
Native Telephony Integration
Connects via standard carrier forwarding or SIP trunking, working with your existing business number.
Natural Voice Synthesis
Human-sounding speech with realistic pacing and intonation, tuned per business rather than a generic default voice.
Multi-Language Support
Detects and responds in the caller's language automatically, without a separate configuration per language.
Full Call Transcription
Every call is transcribed and summarized automatically, feeding straight into your CRM or inbox.
Where a real-time voice agent matters
The moments where a scripted IVR breaks down and a real conversational agent doesn't.
Mid-Call Interruptions
A caller changes their mind halfway through a sentence. The agent adapts instead of finishing a script that no longer applies.
Live Calendar Lookups
The agent checks real-time availability and books a slot on the call, not after a human reviews a request later.
Account or Order Lookups
Callers get answers pulled from live systems (order status, account details) instead of being told to check a website.
Warm Transfers
When a call needs a human, the agent transfers it with full context already spoken to the receiving team.
Multi-Language Callers
A caller speaks Spanish. The agent responds in Spanish automatically, no separate line or setup needed.
High Call Volume
A hundred calls arrive in the same hour. Every one gets the same instant, real-time response. No queue.
Hear the latency and turn-taking for yourself.
Book a Live Demo →Hailey vs. the alternatives
Building a voice agent yourself means stitching together telephony, speech models, and a language model. Hailey ships it as one platform.
| Hailey Voice Platform | Build-Your-Own (Twilio + LLM) | Legacy IVR | |
|---|---|---|---|
| Response latency | Sub-second, tuned pipeline | Depends on your integration | N/A (menu-based) |
| Turn-taking / interruptions | Built in | Custom engineering required | Not supported |
| Function calling mid-call | Native | You build and maintain it | Not supported |
| Telephony setup | Carrier forwarding or SIP, minutes | You configure Twilio yourself | Existing, but rigid |
| Voice quality | Tuned per business | Depends on TTS vendor chosen | Robotic menu prompts |
| Maintenance | Fully managed | Ongoing engineering time | Minimal, but inflexible |
| Time to launch | Minutes to hours | Weeks of integration work | Already live |
Works with your existing stack
See a live call handled end to end.
Book a Free Demo →From phone number to live agent
Connect Your Number
Forward your existing line via carrier forwarding or connect a SIP trunk directly. No new hardware.
Define Actions & Rules
Configure what the agent can look up, book, or transfer, and how it should handle edge cases.
Go Live
The agent starts answering real calls immediately, with full transcripts and function-call logs available.
Ready to hear it on a real call?
Get Started →The difference between a bot and a conversation
Most voice bots fail on latency and interruption handling before they ever get to the actual conversation. Hailey's platform was built to solve that first.
- Sub-second latency that doesn't break the flow of conversation
- Real function calls, not just scripted responses
- Native telephony integration with no custom engineering
- One platform instead of stitching together speech, LLM, and telephony vendors
"We tried building this ourselves on top of a raw LLM API and spent two months just getting latency and interruption handling right. Hailey's platform had it solved on day one."
Got Questions?
Everything you need to know about Hailey AI Voice Agent.
It's a conversational AI system that holds a real spoken phone conversation: understanding natural speech, responding with human-like timing, and calling external functions like calendar or CRM lookups mid-call, instead of following a fixed IVR menu.
The AI receptionist is the packaged product built for a specific business, with industry scripts, booking rules, and a ready-to-use setup. The voice agent is the underlying conversational AI platform that powers it, described here for technical evaluators comparing the technology itself.
Hailey's voice pipeline is tuned end-to-end (speech recognition, reasoning, and voice synthesis) to respond in well under a second, so conversation flow doesn't break the way it does with most voice bots.
Yes. The agent supports natural turn-taking, including callers interrupting mid-sentence, rather than requiring them to wait for a full response before speaking again.
Yes. The agent supports live function calling (checking a calendar, looking up an order, updating a CRM record) as part of the conversation itself.
Either through standard carrier call forwarding on your existing number, or via direct SIP trunk integration for higher-volume or more technical deployments.
The agent passes the call to a human with a spoken summary of context already delivered, so the receiving person doesn't start from zero.
Yes. The agent detects the caller's language and responds in it automatically, with no separate configuration required per language.
Hailey runs a purpose-tuned reasoning pipeline paired with natural voice synthesis, optimized specifically for real-time phone conversation rather than a general-purpose chat model repurposed for voice.
Most voice bots feel like voice bots. This one doesn't.
Book a 15-minute demo and put the voice agent on a live call. Hear the latency and turn-taking for yourself.
Book a Free Demo →One Platform, Every Module.
Hailey's modules share one knowledge base and work together out of the box.
AI Receptionist & Answering Service
→The packaged, ready-to-use product built on top of this voice agent platform, with industry scripts and booking rules included.
AI Chatbot & Customer Support
→The same conversational AI approach, applied to text-based channels like web chat and SMS.
The Hailey Platform
→See how the voice agent shares its knowledge base and conversation history with every other Hailey module.