Here is some telephone history from Tekniikan museo museum located at Helsinki Finland.
Here is once possibly the most common phone model used in Finland (Ericsson Dialog from 1964).
Ans one very old telephone
Here is the first automatic telephone center in Finland from 1922.
Those pictures were taken few months ago. I have posted this material earlier to Facebook.
Some related links:
Telephone sounds at http://www.evan-doorbell.com/
Book on telephone electronics at https://archive.org/details/UnderstandingTelephoneElectronics4thEd