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DIAMETER: Difference between Session Termination Request/Answer and Disconnect Peer Request/Answer ?

+2 votes
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DIAMETER: Difference between Session Termination Request/Answer and Disconnect Peer Request/Answer ?
posted Mar 29, 2014 by Ganesh Kumar

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2 Answers

+2 votes

I have not detailed knowledge of diameter protocol but still can share whatever I know.
Both the "Session Termination Request" and "Session Termination Answer" messages are exchanged between diameter server and client in order to stop the session and clean the resources associated with the session from both the end.

Disconnect Peer Request and Answer messages are exchanged between the Diameter nodes to close the transport connection(i.e. TCP or SCTP) between them. When a diameter client issues disconnect peer request message towards its peer, it also mention cause for disconnection.
For the detailed answer, please check the RFC3588.

answer Mar 29, 2014 by Vimal Kumar Mishra
+1 vote

Hi Ganesh,

First we need to understand the difference between connection and session.

                     +--------+          +-------+          +--------+
                     | Client |          | Relay |          | Server |
                     +--------+          +-------+          +--------+
                              <---------->       <---------->
                           peer connection A   peer connection B

                              <----------------------------->
                                      User session x

A connection refers to a transport-level connection between two peers that is used to send and receive Diameter messages.
A session is a logical concept at the application layer that exists between the Diameter client and the Diameter server; it is identified via the Session-Id AVP.

So now u can understand where DPR/DPA and STR/STA will fit.

I Hope you get some idea.

answer Dec 18, 2015 by Chinmoy Padhi
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