lpbkdotnet, My new bedtime reading has arrived…
In the UK, AC13 telephone signalling used pulses of 2280Hz to represent the digits of a dialled phone number, call progress state etc.
This training document from 1983 was pretty late in the lifespan of in-band signalling like this, which had been around for 20+ years by this point.
It’ll be fun reading this from a “what would it do if I poked $thing at $time” point of view
#telephoneHistory #telecomHistory #telephone #telecoms #phreak #phreaking #phones
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