Diameter: What does mean by implicit terminated session in the context of Diameter protocol ?

Question

In one of the article two keywords "stateless" and "statefull" are used in the context of Diameter protocol.
Can someone please explain about stateless and statefull session with an example ?

Answer 1

When a Diameter client sends request message to server with the Auth-Session-State AVP equal to NO_STATE_MAINTAINED, session is considered as implicitly terminated session. As a consequence, server does not maintain any state information about this session and client does not need to send any session termination request explicitly to server.