3 ms·
Wikipedia has a couple of photos of the units that used to generate dial tones in the German PSTN: https://de.wikipedia.org/wiki/Ruf-_und_Signalmaschine https:
by Hackbraten 2y ago
Wikipedia has a couple of photos of the units that used to generate dial tones in the German PSTN:
https://de.wikipedia.org/wiki/Ruf-_und_Signalmaschine https://de.wikipedia.org/wiki/Ruf-_und_Signalmaschine