ZERO-BARRIER GLOBAL CONVERSATIONS

Speak Your Language.
They Hear Theirs.
In Real-Time.

Sub-400ms bidirectional speech-to-speech telephony translation bridging PSTN callers and mobile devices.

Translates natural voice streams between Punjabi, English, German, and 30+ languages without speech collisions.

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live-translation-session.log

Caller A (PSTN) pa-IN

"ਕੀ ਹਾਲ ਚਾਲ ਹੈ?"

Deepgram STT (Linear16) ~120ms

Context Routing Engine (Immutable Session) ~8ms

ElevenLabs TTS (Mulaw 8kHz WebSocket) ~180ms

Caller B (PSTN) en-US

"How are you doing?"

Total Latency (P50): ~308ms Zero Self-Echo • Source ≠ Destination Validation

Breaking Real-World Language Barriers

Three critical scenarios where instant voice translation changes everything

Cross-Border Family Calls

Speak in native Punjabi or your regional language to relatives abroad speaking English—without requiring them to download any app. Just dial and talk naturally.

Global Business & Logistics

Communicate with international clients and suppliers without hiring interpreters. Close deals, coordinate shipments, and build relationships across language barriers.

Everyday Assistance & Travel

Emergency services, healthcare consultations, and everyday situations where you don't know the local language. Get help when you need it most.

Deep Telephony & AI Pipeline Architecture

Production-grade real-time voice processing built from first principles

Telephony Layer

Twilio Media Streams

Bidirectional WebSocket audio streams

G.711 μ-law Encoding

8000 Hz native telephony-grade audio frames

PSTN Integration

Direct landline/mobile connectivity

Real-Time STT

Deepgram Nova-2

Streaming VAD with endpointing

Punctuation Hooks

Natural speech boundary detection

Multi-Language Models

30+ language simultaneous support

Immutable Routing

Context-ID Bounded Sessions

Strict source ≠ destination validation

Race Condition Elimination

State machine guarantees ordering

Zero Self-Echo

Directional audio flow enforcement

Zero-Echo Low-Latency TTS

ElevenLabs Flash

WebSocket streaming synthesis

Native 8kHz Audio

Direct carrier leg injection

Stream Buffering

Adaptive chunk delivery

Performance Benchmarks

Production metrics from real-world telephony deployments

< 400ms

P50 Streaming Path

Latency

End-to-end voice-to-voice translation time

100%

Zero Self-Audio

Concurrency Safety

Strict source ≠ destination validation

30+

Direct & Pivot Routed

Language Coverage

Including regional dialects and variants

PSTN

Landline + Mobile

Telecom Reach

No app required for callee

Technical Stack

Telephony

• Twilio Media Streams

• WebSocket Bidirectional

• G.711 μ-law @ 8kHz

AI Pipeline

• Deepgram Nova-2 STT

• Groq Translation

• ElevenLabs Flash TTS

Infrastructure

• Node.js Runtime

• AWS EC2 Deployment

• PM2 Process Management

THE SOLO BUILDER

Engineered from Scratch by a Solo Systems & Telephony Builder

VoxSync was conceived, architected, and fully implemented by a high-agency solo engineer—from raw WebSockets and RTP/PCM handling to state bridges and edge deployments.

System Design

Complete telephony architecture from first principles

Implementation

Full-stack development across telecom and AI layers

Deployment

Production infrastructure and reliability engineering

Built with the conviction that language should never be a barrier to human connection.

Speak Your Language. They Hear Theirs. In Real-Time.