What is the essence of the provider's MAC address cipher?

Question

Encryption

When the megaphone installer came to me to install the Internet, he dictated the poppy address not in 2 characters (in ordinary letters / numbers), but with the help of some kind of cipher in which the words "Boris" and "Heron" were present, tell the secret of who knows how it is decrypted and what kind of cipher it is in general?

Answer 1

No cipher. It's just a way to pass the letter so that you don't have to ask again. Often used in telephone conversations.
Boris is B or b
Heron is C or c
Any words can be used (UPD: it turns out there is a standard). If only it was easy to hear them through the noise and the first letter was unambiguous.

Answer 2

It is used in radio communications when transmitting the spelling of difficult-to-read words, abbreviations, call signs, e-mail addresses, and the like in order to reduce the number of errors.

https://ru.wikipedia.org/wiki/Phonetic_alphabet
https://ru.wikipedia.org/wiki/Phonetic_alphabet_ICAO