This Recommendation therefore highlights some important security mechanisms that can be used to realize the requirements in [ITU-T Y.2701] and specifies the suite of options to be used for each selected mechanism to reduce interoperability and mismatch problems. The list of mechanisms described in this Recommendation is not exhaustive. NGN providers are encouraged to support additional security tools, capabilities and operational measures as needed beyond the mechanisms specified in this Recommendation for NGN security protection. This Recommendation is intended to be used with [ITU-T Y.2701] to provide a base for NGN security. It should be used with other security-related Recommendations and other specifications as appropriate for specific security areas.