Project Overview
We built a real-time AI voice agent that answers calls, understands natural speech, and completes tasks — booking appointments, answering questions, and routing complex calls — with low-latency, human-like conversation.
The Challenge
The client's phone lines were overwhelmed, callers abandoned long IVR menus, and after-hours calls went unanswered, costing bookings and goodwill.
- High call volume with long hold times
- Rigid IVR menus frustrated callers
- After-hours calls went unanswered
- No way to capture intent from spoken language
Our Strategic Approach
We assembled a low-latency pipeline of streaming speech-to-text, an LLM for reasoning, and natural text-to-speech, with barge-in support so callers can interrupt naturally.
The Solution We Delivered
The voice agent handles calls 24/7, completes bookings and FAQs autonomously, and warm-transfers to staff with context when a human is needed.
- Real-time streaming speech recognition
- Natural, low-latency text-to-speech with barge-in
- Task completion: bookings, lookups, and FAQs
- Warm transfer to humans with full call context
- 24/7 availability across multiple languages
- Call transcripts, summaries, and analytics
Technologies Used
- Streaming STT — Real-time speech-to-text
- LLM — Dialog reasoning and task execution
- Neural TTS — Natural-sounding voice output
- Twilio — Telephony and call routing
- WebRTC — Low-latency audio streaming
- Node.js — Real-time orchestration service
Development Process
- Call-flow analysis — Mapped common call reasons and desired outcomes.
- Latency engineering — Tuned the STT-LLM-TTS pipeline for natural turn-taking.
- Task integration — Connected booking and lookup systems for real actions.
- Handoff design — Built warm transfer with context for complex calls.
- Pilot & tuning — Ran live-call pilots and refined prompts and voices.
Results & Impact
The voice agent absorbed routine call volume around the clock while keeping callers satisfied.
- Over 70% of calls handled without a human
- After-hours bookings captured 24/7
- Average hold time effectively eliminated for routine calls
- Caller satisfaction improved on handled calls
🎯 Key Takeaway
A natural, low-latency voice agent turned an overloaded phone line into an always-available service channel that completes real tasks.
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