Meet Your iPhone’s Grandparent

[Massimo Gnerucci]

(11-07-2018 05:49 PM)Sylvain Cote Wrote:  

(10-05-2018 06:08 AM)Massimo Gnerucci Wrote:  Well, there was this:

The acoustic coupler was able to transmit and receive data but it was unable to dial or answering a phone call.
You had to manually do the call with a rotary or push button phone and wait for the dial tone before inserting the handset into the coupler.

I have one, but never used it.
However you're right: that's the way acoustic couplers worked.