HTTP API Dictionary (SBI Service API)¶
A dictionary for looking up the key service APIs each NF offers over the SBI (Service Based Interface) by providing NF, use, and related reference point. All operate over HTTP/2 + JSON over TLS.
Related: Protocol Dictionary / NF Dictionary / Interface Dictionary / Registration chapter
SBI service API list¶
| Service API | Providing NF | Main use | Related reference point | Spec |
|---|---|---|---|---|
| Namf_Communication | AMF | NAS/N2 message exchange, inter-AMF coordination (representative operations illustrated; details to be confirmed) | N11 / N14 | TS 29.518 |
| Namf_EventExposure | AMF | Exposure of events such as mobility (details to be confirmed) | — | TS 29.518 |
| Nsmf_PDUSession | SMF | PDU session control (Create/Update/ReleaseSMContext, etc.; illustrative) | N11 | TS 29.502 |
| Nudm_UECM | UDM | Serving NF registration management (details to be confirmed) | N8 | TS 29.503 |
| Nudm_SDM | UDM | Subscription data retrieval and change notification (details to be confirmed) | N8 / N10 | TS 29.503 |
| Nudm_UEAuthentication | UDM | Authentication information provision (details to be confirmed) | N13 | TS 29.503 |
| Nausf_UEAuthentication | AUSF | UE authentication (5G-AKA / EAP-AKA'; details to be confirmed) | N12 | TS 29.509 |
| Npcf_SMPolicyControl | PCF | SM policy / PCC rule (details to be confirmed) | N7 | TS 29.512 |
| Npcf_AMPolicyControl | PCF | AM policy (details to be confirmed) | N15 | TS 29.507 |
| Npcf_PolicyAuthorization | PCF | Policy authorization of AF requests (details to be confirmed) | N5 | TS 29.514 |
| Nnrf_NFManagement | NRF | NF registration / update / deregistration (details to be confirmed) | — | TS 29.510 |
| Nnrf_NFDiscovery | NRF | NF discovery (details to be confirmed) | — | TS 29.510 |
| Nnssf_NSSelection | NSSF | Slice selection (details to be confirmed) | N22 | TS 29.531 |
| Nnef_* (capability exposure family) | NEF | Capability exposure Northbound API (operation set; details to be confirmed) | N33 | TS 29.522 |
| Nudr_DataRepository | UDR | Data persistence (details to be confirmed) | N35 / N36 / N37 | TS 29.504 |
| Nchf_ConvergedCharging | CHF | Converged charging (details to be confirmed) | N40 | TS 32.290 |
| Nsmsf_SMService | SMSF | SMS over NAS (details to be confirmed) | N20 | TS 29.540 |
| Nnwdaf_AnalyticsInfo / EventsSubscription | NWDAF | Data analytics (details to be confirmed) | — | TS 29.520 |
| Nbsf_Management | BSF | Session⇔PCF binding management (details to be confirmed) | — | TS 29.521 |
Reference points and services are two views of the same thing
In SBI, "reference point Nxx (e.g., N8)" and "service Nxxx (e.g., Nudm)" refer to the same inter-NF coordination under different names. Each API commonly operates over HTTP/2 + JSON over TLS (TS 29.500 defines the framework), and the destination is resolved by the NRF's NFDiscovery, so do not assume a fixed listening port. For the specifics of resource URIs, HTTP method assignments, and operation details, refer to the relevant chapters of each TS (this dictionary is for indexing purposes).