3gpp-Sbi-Callback Header
The SMF populates the "3gpp-Sbi-Callback" header in the callback requests with the callback service name for the SCP to provide the differentiated services.
Following is the format of this header:
"N<NF>_<service name>_<name of the callback service operation in the corresponding OpenAPI specification file>"
Some of the examples are as follows:
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Notification to AMF is sent as "Nsmf_PDUSession_smContextStatusNotification"
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Notification to vSMF is sent as "Nsmf_PDUSession_StatusNotify"