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My father used teletypers while he was in the navy. He sorta described the OTO (operator to operator) process, between ships. The sending ship would call the receiving ship on SATCON and inform them of the HF frequency to which they were trying to communicate on. Receiving ship would then tune to the frequency and begin communications. Most of the time there would be multiple designated receiving and transmitting station onboard. Occasionally, the data would be run through a cryptograph machine to encode the message should it contain sensitive material. He mentioned how the machines sat in standby clicking away like a small steam engine until data was received. All in all, a dated, but necessary process back in the day.
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