Kees van Eeten wrote to Robert Bashe on Monday July 09 2018 at 01:35:

ml>>> that would be when ISDN came around... ISDN doesn't have a dial
ml>>> tone... dial tone is what distinguishes a POTS line from any
ml>>> other...

RB>> Maybe in the States, but certainly not here in Germany. I get a dial
RB>> tone on my ISDN line every time I pick up the phone.

KE> Can you be shure?. My guess is that your phone generates a dial tone
KE> when it establishes a free channel to the exchange.

All I know is that when I press a "0" I get an outside line and a dial tone.
And I have only ISDN plus DSL. Genuine ISDN, not an emulation. It goes through
the Telekom. And people can reach me using that ISDN line. I used to have some
points who connected by ISDN.

Cheers, Bob

--- GoldED+/W32 1.1.5-0613