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Rotary-dial analogue phones were once a necessity, but now they lay dormant on shelves or tucked away in attics. This is largely due to the replacement of traditional landlines with fibre-optic modems, rendering analogue phones obsolete.
In addition to their sentimental value, rotary dial phones provide several advantages, including reduced electrosmog emissions, protection against eavesdropping, repurposing outdated technology, and promoting a slower pace of life.
The contribution explains how to build a private telephone exchange for eight people using rotary dial phones. The exchange is powered by a Raspberry Pi and custom analogue electronics. The following themes are covered:
- The construction of a PBX which resembles telephone exchanges in various countries worldwide, giving users a realistic experience.
- Handling of call initiation, routing, full duplex voice transmission and human-machine communication.
- The software implementation on the Raspberry Pi running Linux.
- A study of enhancing the open-source software with additional functionalities.
Due to the readily available Raspberry Pi hardware and software programmability, this project invites everyone to participate.