Event

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provide several advantages, including reduced electrosmog emissions, protection against eavesdropping, repurposing outdated technology, and promoting a slower pace of life.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.