Multi-Tenant Real-Time Voice AI & Telephony Platform
Ultra-low latency (<800ms) bidirectional conversational voice assistant powered by LiveKit WebRTC, Retell AI, and OpenAI Realtime WebSockets with multi-tenant isolation.
Problem Statement & High-Level Architecture
Engineered an enterprise real-time voice AI assistant capable of holding fluid, natural telephone and web voice conversations with sub-800ms response latency, automated speech-to-text transcription, dynamic CRM tool calling, and tenant isolation across commercial brands.
Engineering Design & Data Pipeline
The platform interfaces with LiveKit WebRTC audio rooms, Retell AI, and OpenAI real-time WebSockets to stream audio buffers bidirectionally. Engineered with Python, Django, and asynchronous event loops, custom agent routines dynamically inject tenant-specific knowledge bases, trigger API tool calls, log conversation transcripts, and route warm leads directly into client CRMs.
Platform Features & Technical Capabilities
Bidirectional WebSocket & LiveKit WebRTC audio streaming for near-instant conversational latency (<800ms)
Multi-tenant tenant routing isolating system prompts, knowledge bases, and webhooks per client brand
Dynamic agent prompt definitions with custom function calling & API tool execution
Real-time speech-to-text (STT) and neural text-to-speech (TTS) voice synthesis with instant interruption handling
Automated call transcription logging, sentiment tagging, and CRM synchronization
Engineering Bottlenecks & Architectural Solutions
Eliminating conversational audio lag, handling acoustic room echoes, and routing multiple enterprise tenants through a single scalable voice backend.
- High latency across traditional sequential STT → LLM → TTS voice pipelines.
- Acoustic echoes causing self-interruption in open speaker environments.
- Tenant prompt cross-talk and memory leakage in multi-tenant telephony servers.
Implemented optimized WebRTC audio buffering, server-side voice activity detection (VAD), and tenant-isolated routing middleware with asynchronous event loops.
- Sub-800ms full-duplex conversational turnaround via LiveKit WebRTC and OpenAI Realtime.
- Real-time server-side Silero VAD halting synthesis speech instantly on user barge-in.
- Isolated virtual rooms with strict tenant-scoped tool and CRM sandboxes.