# Open source retro AI phone: Siemens S62 + Raspberry Pi + Retell **URL:** \ **Category:** Open Source Repos\ **Created:** [April 20, 2026, 9:18am UTC](https://community.retellai.com/t/open-source-retro-ai-phone-siemens-s62-raspberry-pi-retell/2396 "2026-04-20T09:18:41Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![fabryz](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/fabryz/32/1454_2.png) [@fabryz](https://community.retellai.com/u/fabryz)\ **Post date:** [April 20, 2026, 9:18am UTC](https://community.retellai.com/t/open-source-retro-ai-phone-siemens-s62-raspberry-pi-retell/2396/1 "2026-04-20T09:18:41Z")
Hi everyone, I wanted to share a small open source project I built with Retell. I restored a Siemens S62 (“Bigrigio”), a classic Italian desk phone, and connected it to a Raspberry Pi Zero 2 W so it can place and receive live AI phone calls through Retell using pjsua/SIP. What it currently does: - hook detection via GPIO - starts a Retell SIP call when the handset is lifted - hangs up when the handset is placed back down - ALSA audio routing on Raspberry Pi - local WAV recording for debugging - systemd autostart support This was especially fun for me because I’m mainly a backend engineer, not an electronics expert, and this was my first time really opening up and rewiring a vintage analog phone like this 🙂 Repo: [https://github.com/Fabryz/siemens-s62-retell-phone](https://github.com/Fabryz/siemens-s62-retell-phone) Write-up: [https://medium.com/@fabryz/from-a-flea-market-siemens-s62-to-an-ai-phone-204b35eacc12](https://medium.com/@fabryz/from-a-flea-market-siemens-s62-to-an-ai-phone-204b35eacc12) Still improving: - rotary dial support - better microphone placement inside the handset - cleaner volume / audio tuning If this fits better in another category, feel free to tell me and I’ll move it ![photo_5985292417860570115_w](https://canada1.discourse-cdn.com/flex008/uploads/retell1/original/2X/7/75d0544a6115046a27dbf5b30602d57bfaee75b5.jpeg)