Hacker News: mcintyemhttps://news.ycombinator.com/user?id=mcintyemHacker News RSShttps://hnrss.org/hnrss v2.1.1Sat, 13 Jun 2026 12:48:45 +0000<![CDATA[New comment by mcintyem in "Show HN: OpenPayphone – open-source guts for a 1996 coin payphone (Pi and SIP)"]]>Author here. My wife gave me a dead ~1996 Ernest D3 coin payphone for my birthday; the original board was toast, so I gutted it and rebuilt the internals with a Raspberry Pi Zero 2W, with PoE, audio, and custom HATs + an open-source SIP stack and kept it genuinely coin-operated (escrow, rate plans, intercept tones, and a hidden hold-# refund trick).

Two highlights: the call-progress tones come from the codec's hardware tone generator (it's like IQ had this in mind?) and the software is multiprocess behind a board HAL (including a mock backend so the phone logic is unit-testable without the hardware). Repo has the PCB/BOM/parts too, plus a 3-part write-up. Happy to answer anything.

Write-up: http://blog.1in1e6.com/2026/06/payphone-part-1-new-old-phone...

(for the AI crowd - I architected it, but used Claude Code to fill it in; that's part 3 of the write-up.)

]]>Sun, 07 Jun 2026 16:47:35 +0000https://news.ycombinator.com/item?id=48436529mcintyemhttps://news.ycombinator.com/item?id=48436529https://news.ycombinator.com/item?id=48436529<![CDATA[Show HN: OpenPayphone – open-source guts for a 1996 coin payphone (Pi and SIP)]]>Article URL: https://github.com/eric-cgn/openpayphone

Comments URL: https://news.ycombinator.com/item?id=48436434

Points: 23

# Comments: 1

]]>Sun, 07 Jun 2026 16:36:29 +0000https://github.com/eric-cgn/openpayphonemcintyemhttps://news.ycombinator.com/item?id=48436434https://news.ycombinator.com/item?id=48436434