The mobile phone may be sweeping away the traditional wired phone, but that doesn’t change the fascinating history and technology of the older device. At [This Museum Is Not Obsolete] they have a fully functional mechanical telephone exchange as one of their exhibits, and they’ve published a video examining the various sounds it’s capable of making.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/06/02/why-your-old-phone-sounded-the-way-it-did/