Server Header
The SMF includes "Server" header in all the error responses to peer NF for information on the source of error. Following is the format of this header:
UDM:"nf-instance-id"
For example, UDM:"54804518-4191-46b3-955c-ac631f953ed8"
On receiving an error response, SMF as a client, extracts the NFType from the "Server" header and triggers the SCP failure handling. If you have configured the Model D and if the "Server" header indicates the NF peer, then the SMF ignores the "retry" failure handling action. If you have configured "retry-fallback" as SCP failure handling, then SMF falls back to the local configuration without any retry action. After the SMF fallback, any failure is handled according to the NF failure handling configuration.
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