The Diameter Protocol is a crucial signaling protocol used in 5G networks for authentication, authorization, and accounting (AAA). Understanding its call flow is essential for professionals working in 5G core networks!
Breaking it down step-by-step:
Step 1 – NAS PDU Session Establishment Request 
Step 2 – SM Context Creation in AMF 
Step 3 – N4 Session Establishment 
Step 4 & 5 – DER (Diameter Request) & DEA (Diameter Answer) 
Step 6 & 7 – N1 N2 Message Transfer (Authentication) 
Step 9 – PDU Session Update 
Step 10-14 – Diameter Exchange & Accounting Start 
Step 15 – NAS PDU Accept
Step 16 – NAS Deregistration Request 
Step 17 – PDU Session Release 
Step 18-19 – Accounting Stop & Completion 
Why does this matter?
The Diameter Protocol ensures secure and efficient communication across the 5G core network, facilitating seamless data transfer, authentication, and session management!
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