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:

  • Notification to AMF is sent as "Nsmf_PDUSession_smContextStatusNotification"

  • Notification to vSMF is sent as "Nsmf_PDUSession_StatusNotify"