UDP (User Datagram Protocol)

UDP (User Datagram Protocol) is one of several core protocols commonly used on the Internet. Used by programs on networked computers to send short messages, called datagrams, between one another. UDP is a lightweight message protocol, and compared to TCP, is stateless and more efficient at handling lots of short messages from many clients.

NENA-STA-010, NENA i3 Standard for Next Generation 9-1-1