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Tyler Hatfield edited this page Aug 30, 2026 · 6 revisions

DecaTone Documentation Wiki

Welcome to the official DecaTone V1.0 documentation wiki. DecaTone is an open-source private telephone switch and VoIP hardware system designed to revive vintage rotary telephones by replacing their internal electromechanical central-office circuitry with an ESP32-S3 microcontroller and linking them to a self-hosted cloud switchboard.

📖 Wiki Navigation

  1. Hardware Wiring and Pinouts
    • Hosyond ESP32-S3 pin mappings, hook switch detection, rotary pulse decoding, MAX98357A I2S DAC, MAX4466 mic ADC, and IRF640N resonant AC bell ringer circuit.
  2. Firmware Flashing and Setup
    • Initial flashing via PlatformIO / esptool, captive portal provisioning (DecaTone-Setup-XXXX), dynamic power-saving frequency scaling, and OTA remote updates.
  3. Backend and Docker Deployment
    • Docker Compose installation, Let's Encrypt SSL configuration, reverse proxy setup (Nginx, Traefik, Caddy, Cloudflare), and Home Assistant MQTT integration.
  4. Phone Numbering, Routing and Dial Codes
    • Extension allocation, area codes, single-digit speed dial (1–9), in-call keypad commands (0, 1, 2, 3+ext), 0XX off-hook control codes, and call privacy filtering.
  5. Audio Normalization and Bell Ringer Tuning
    • Real-time inbound audio normalization, outbound mic AGC, acoustic vintage DSP filters, 20Hz bell ringing resonance sweep, and cadence patterns.
  6. User and Admin Operations Guide
    • User onboarding, friend requests, VIP friend designation, voicemail studio, DND quiet hours schedules, and admin fleet management.
  7. Troubleshooting and FAQ
    • Common gotchas, rotary governor speed & break ratio tuning, bell ringer MOSFET power tuning, and network diagnostic tools.

🚀 Quick Technical Summary

  • Target Microcontroller: Hosyond ESP32-S3-WROOM-1 (Dual-Core 240MHz Xtensa LX7, 8MB Octal PSRAM, 16MB Flash).
  • Backend Architecture: Node.js 20, TypeScript, SQLite3 (WAL mode) with high-performance indexing, WebSocket VoIP switchboard engine.
  • Frontend Architecture: React 18, Vite, Lucide Icons, Pure CSS Design System, WebPhone softphone.
  • Official Docker Image: tylerhats/decatone:latest (also tagged v1.0.0).
DecaTone Open-Source Vintage Rotary Phone VoIP Switch • Licensed under GNU GPL v3.0

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