Diameter
Read this article about the history of Diameter and why it was developed. What preceded Diameter as an authentication protocol? While you do not need to understand how Diameter authenticates, you should have a general idea of its authentication process.
6.Diameter Client API
6.6.Terminateconnection API
TerminateConnection API is used for the terminating the connection established between
DIAMETER client with the DIAMETER server which deals with the deletion of
transmission sockets, timers.