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Implement support for Node-Identifier IE in GTPv2 S2b Create-Session-Request to SMF for Diameter S6b integration This patch adds support for processing the Node-Identifier IE within GTPv2 Create-Session-Request messages sent via the S2b interface to the SMF. When the ePDG includes the Node-Identifier IE containing both host and realm of the AAA-Server, the SMF now uses this information to populate the Destination-Realm and Destination-Host AVPs in the Diameter S6b AAR message. This enables seamless integration and allows the SMF to route requests directly to the appropriate AAA-Server, enhancing interoperability in setups where the host and realm data are required by the Diameter network.