Feature Description

SMF gives higher priority to the NFs that are discovered from NRF over the locally configured NFs. SMF uses the locally configured NFs only if the NRF endpoints are not configured or if no NFs are available as part of the NF discovery response. This response appears after the query filter criteria are met. Each NF discovery response has an associated validity time and SMF caches the NF discovery response, uses the cache for subsequent session activation. SMF performs NF discovery only if matching entries are unavailable for the query filter in its NF discovery response cache or if the entry in cache exists, however with the expired validity.