DNS over phone
DialDNS lets a caller ask a recursive resolver questions by telephone, turning spoken interaction into a novel DNS client interface.

DialDNS lets a caller interact with a recursive DNS resolver over a phone connection. It takes the familiar act of asking a resolver a question and makes it audible.
The project is a useful counterpoint to protocol tunnelling: the phone is the user interface, not the DNS transport.
Primary source: https://mastodon.nl/@koenvh/113720120465276082