Diameter Routing Function
Diameter routing function includes routing based on application ID and realm name, incoming peer ID, host name, command code subscriber ID (IMSI, MSISDN, PUI, PVI),etc.
SS7 Routing Function
Diameter Signaling Screening Function
SS7 Signaling Screening Function
BSF (Binding Support Function) implements the PDU session binding function for 5G users. In BSF, each PDU session stores the session binding information including user ID, DNN, UE address (IP address or MAC address), and PCF address selected by SMF. It provides the PCF address query service for AF or NEF to ensure that the AF can identify the UE's service based on the UE address, so that the N5/Rx interface messages can be routed to the corresponding PCF for the PDU session of the UE.
SEPP provides the following functions for 5G signaling protection:
• Topology hiding
• Message filtering
• Confidentiality protection of parameters (such as SUPI), etc.