tui is a user interface for mobile phones with keypads. It runs on text console or under nano-X, and communicates with modem part with AT commands. It runs well on Siemens SX1 running linux, and allows you to call from it and answer calls.
A terminal user interface which works on an ASCII terminal and uses the keyboard to navigate.
Like GUI but uses digital phones instead. UDP (User Datagram Protocol): connectionless protocol that, like TCP, runs on top of IP networks. Unlike TCP/IP, UDP/IP provides very few error recovery services, offering instead a direct way to send and receive datagrams over an IP network. It's used primarily for broadcasting messages over a network.