5G core network made a bold choice: instead of using telecom-specific protocols (Diameter, GTP-C) for signaling between network functions, it uses HTTP/2 and RESTful APIs — the same technology that powers the web. This means 5G core NFs communicate like web services: GET /nudm-sdm/v2/imsi-123/am-data POST /nsmf-pdusession/v1/sm-contexts