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OpenPayphone – open-source guts for a 1996 coin payphone (Pi and SIP)

by mcintyem·Jun 7, 2026·3 points·1 comment

AI Analysis

●●SolidNiche GemCozy

SIP payphone with coin detection running on a Pi—actual hardware craft, not emulation.

Strengths
  • Typed event bus coordinates state machine, SIP client, GPIO, and call recorder cleanly.
  • YAML config handles dial plans, coin values, and refund logic without code changes.
  • Blog documentation walks the full build—rare for hardware hobby projects.
Weaknesses
  • Extremely narrow audience—how many people own functional 1996 payphones?
  • No Windows support mentioned, and high-voltage warnings limit recreation appeal.
Category
Target Audience

Hardware hobbyists, VoIP enthusiasts, retro tech restorers

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