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To give you an idea of the technology back then, we used an acoustic coupler modem and a teletype terminal.
www.gizmodo.com.au This audio tone was then transmitted using an acoustic coupler (a speaker, in this case) attached to the microphone of a common telephone handset.
en.wikipedia.org Early on, some chasers carried acoustic couplers to download batches of raw surface and upper air data from payphones.
en.wikipedia.org The earliest versions used acoustic couplers or key phones; then smaller terminals with internal modems.
en.wikipedia.org Direct electrical connections to telephone networks, once they were made legal, rapidly became the preferred method of attaching modems, and the use of acoustic couplers dwindled.
en.wikipedia.org