AI Voice Agent
A production-grade real-time AI voice calling system for B2B outreach, qualification, and appointment booking — conducting natural phone conversations autonomously at scale, with live calendar integration and concurrent call handling.
Key Result
Sub-800ms end-to-end vocal latency. 500+ concurrent daily calls handled. 40% uplift in booked B2B meetings. 70% reduction in manual SDR call costs.
The Challenge
Outbound B2B calling, qualification, and appointment reminders consume massive SDR bandwidth. Scaling outreach means linearly scaling headcount — an expensive, slow, and error-prone approach that most early-stage ventures cannot afford.
The Solution
Founded and built a production-grade real-time AI voice calling system — combining sub-800ms speech-to-text, LLM reasoning, streaming voice synthesis, and telephony orchestration to conduct natural phone conversations at scale, with live calendar booking and concurrent call handling.
Architecture & Engineering Stack
- Sub-800ms end-to-end voice pipeline: Whisper / Deepgram STT → OpenAI Realtime API → ElevenLabs streaming TTS
- LangChain + LlamaIndex RAG knowledge retrieval for contextual, domain-accurate B2B responses mid-call
- Live calendar API integration and CRM sync occurring during the active phone call
- Vapi / Retell / LiveKit telephony media stream orchestration for 500+ concurrent inbound and outbound calls
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