What's New in This Guide

This section lists the documentation updates for release 25.2.2xx.

Release 25.2.200- G40404-01, February 2026

• Feature Updates:
  • New Features:
    • NRF Client Retry and Health Check: The NRF Client Health Check continuously and automatically assesses the health of NRF instances, ensuring high service availability and seamless failover, especially in georedundant environments. It features configurable intervals, intelligent health status updates, and a retry mechanism to minimize service disruption and manage network failures.
      • No new metrics have been added for this feature. However, it uses the existing "nrfclient_nrf_operative_status" metric from the NSSF Common metrics section.
      • No new alerts have been added for this feature. However, it uses the following Application Level Alerts:
        • OcnssfAllNrfInstancesInDownStateCritical
        • OcnssfNrfInstancesInDownStateMajor
    • Support for TLSv1.3 on Internal API Communication: Improved security for inter-service communication, reinforced by new metrics to monitor TLS certificate statuses and address resolution failures.
      • Added the following metrics in the NSSF Metrics section:
        • oc_ingressgateway_ip_addresses_fetch_failure
        • oc_egressgateway_ip_addresses_fetch_failure
        • oc_certificatemanagement_tls_certificate_info
        • oc_certificatemanagement_tls_secret_status
        • oc_certificatemanagement_tls_certs_reload_failure
        • cgiu_jetty_ip_address_fetch_failure
    • Support for Dual Stack: Added comprehensive handling for both IPv4 and IPv6, with new monitoring metrics to track ingress and egress IP types and rejections.
      • Added the following metrics in the NSSF Metrics section:
        • oc_ingressgateway_incoming_ip_type
        • oc_ingressgateway_outgoing_ip_type
        • c_egressgateway_incoming_ip_type
        • oc_egressgateway_outgoing_ip_type
        • oc_egressgateway_dual stack_ip_rejected_total
  • Architectural Enhancements:
    • The NSSF’s core architecture has been redesigned to implement an in-memory, pod-level cache, reducing latency and dramatically boosting throughput. NsSelection throughput has increased from 10k to 80k TPS (an 8x improvement), with CPU consumption scaling from 60 to 120 cores (a 2x increase).
    • The architecture now supports large-volume messages in NsAvailability PUT operations, allowing all TAIs to be transmitted in a single message.
    • The NSSF schema and REST APIs have been overhauled to support in-memory caching. Corresponding REST API configuration options and details are now available directly from the CNC Console.
  • Deprecations and Removals (Driven by Architectural/Business Requirements)
    • Autopopulation of Configuration Using NRF Content: Removed due to the introduction of new Candidate AMF selection logic and redundancy in AMF set configuration with updated functional behavior.
    • Handover from EPS to 5G: Deprecated, as call transfer use cases are now handled through independent selection requests per updated customer requirements.
    • Optimized NSSAI Availability Data Encoding and TAI Range: Removed because TAI ranges are no longer viable, given non-incremental TAC assignments reported by customers.
    • Protection from Distributed Denial-of-Service (DDoS) Attack through Rate Limiting and Ingress Gateway Pod Protection: Both features are now obsolete with the introduction of pod-level rate limiting and updated protection mechanisms in the gateway’s latest releases.
    • Time of the Day Based Network Slice Instance Selection: Deprecated from this release.
    • IPv6 Support: Removed as a standalone feature and superseded by the "Support for Dual Stack feature.
    • Ingress Gateway Pod Protection: Removed as it is now considered obsolete due to the introduction of pod-level rate limiting in newer gateway releases.
    • Deprecated metrics and alerts have been cleaned up for a more focused monitoring and troubleshooting experience.
    • Details of several existing alerts and metrics have been updated and outdated alerts and metrics have been removed.
• General Updates:
  • Updated release number to 25.2.200 throughout the document.
  • Added a feature description section for Support for cnDBTier APIs in CNC Console. The corresponding UI details were also updated for it in the Configuring NSSF using CNC Console section.
  • Configuring NSSF using CNC Console: New and redesigned UIs simplify CNC-configured NSSF options, system settings, and profile management, while outdated UIs have been removed to streamline user interaction.
  • Updated Table 4-20 in Supports Compression Using Accept-Encoding or Content-Encoding gzip feature section to remove the unsupported POST method from the response.
  • Added new error scenarios for Subscription with HTTP Patch (Option ADD in the Subscription Modification Feature section.
  • Added the following new NSSF Metrics:
    • ocnssf_indirect_communication_request_rx_total
    • ocnssf_indirect_communication_response_tx_success_total
    • ocnssf_indirect_communication_response_tx_failure_total
    • ocnssf_subscription_request_rx
    • ocnssf_subscription_response_tx_success_total
    • ocnssf_subscription_response_tx_failure_total
    • ocnssf_nssaiavailability_error_tx_total
    • ocnssf_nssaiavailability_options_tx_status_unsupportedmediatype_total
    • ocnssf_nsavailability_unsupported_plmn_total
    • ocnssf_state_data_write_error
    • stale_records_computation_DQD_amf_tai_slice_availability_data_seconds_count
    • stale_records_computation_JL_amf_tai_slice_availability_data_seconds_count
    • total_stale_records_APD_amf_tai_slice_availability_data_seconds_count
    • count_amf_tai_slice_availability_data_stale_records_deleted_total
    • stale_records_computation_DQD_nssai_subscriptions_seconds_count
    • stale_records_computation_JL_nssai_subscriptions_seconds_count
    • total_stale_records_APD_nssai_subscriptions_seconds_count
    • count_nssai_subscriptions_stale_records_deleted_total