ATIS-1000029.2008 (NGN Security Requirements) provides security requirements for next generation networks (NGNs) and its interfaces (e.g., UNIs, NNIs and ANIs). This standard describes some security mechanisms that can be used to fulfill the requirements described in ATIS-1000029.2008 and specifies the suite of options for each selected mechanism. Specifically, this standard describes identification, authentication and authorization mechanisms; then discusses transport security for signalling and OAMP, and media security. It then describes audit-trail-related mechanisms and finally describes the provisioning. The security mechanisms described in this standard are based on use of the trust model defined in ATIS-1000029.2008.