Facsimile transmission, commonly known as fax, is a method of sending copies of documents via telephone lines.
A telegram is a message transmitted by telegraphic equipment, which uses coded signals sent over electronic wires. The message is usually delivered within hours via phone or direct delivery. While outdated for general information transfer, telegrams are still used for certain money transfer services.
Voice over IP (VoIP) is a technology that enables the transmission of voice communications over data networks such as the Internet or corporate intranets. It is commonly referred to as Internet telephony. VoIP has revolutionized telecommunications by enabling voice calls to be transmitted over the internet, providing cost-effective and flexible communication solutions.
