Telephony has revolutionized the way people talk, shaping human interactions, business operations, and technological advancements. From its early beginnings with Alexander Graham Bell’s invention of the phone in 1876 to the delicate cellular networks and digital communications of today, telephony has evolved into a crucial element of world connectivity. In https://docs.google.com/spreadsheets/d/1teK7cKOwO3hL_NuYIG16FWw0aH-u2AvrJ8C9Y6sRxFg/edit