Call Flows
This section describes the call flow for selecting and using SEPP.
The following types of requests are sent from a client to a server:
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Requests to API roots - These requests are sent to the API root as defined in the YAML. The following headers are added to the request:
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3gpp-Sbi-Target-apiRoot - The value of this header is the FQDN of the NF that services the request. For requests sent to the hSMF, this is the hSMF FQDN.
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Authority - The value of this header is the server SEPP to which the request is sent to by the client. When the request is sent by the vSMF, the value is vSEPP, and when the request is sent by the hSMF, it's hSEPP.
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Callback Requests - These requests are callbacks that are invoked across PLMN boundaries. The values of the header field in such requests are defined in 3GPP TS 29.500, Annex B.

Step | Description |
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1 - 2 | The vSMF initiates the procedure by sending an indication to hSMF about using a SEPP and the address of the SEPP. The call flow sequence for this forward messaging is as follows:
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3 - 4 | The hSMF responds with a callback header value. The call flow sequence for this return messaging is as follows:
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