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I am speaking as a German. Sure, larger businesses used proper ISDN, but your uncle/mom didn't. The best you could hope for there was only DECT compression, aka

by namibj 8y ago

I am speaking as a German. Sure, larger businesses used proper ISDN, but your uncle/mom didn't. The best you could hope for there was only DECT compression, aka ADPCM 4bit/8kHz.

gsich 8y ago
Sure they did. Adoption rate was about 30%, possibly even higher at it's peak. DECT codec is useless if it's transmitted through analog lines, as it gets converted to standard 3.4k-Hz quality anyway. Except for in-house calls of course.