This standard describes Next Generation Network (NGN) signaling support for Operator Regular Intercept. The service may be invoked when an NGN caller attempts to set up a call/session to an `intercepted number' where the address of the called party has changed. In the event that the old address has been replaced with multiple new addresses (`split referral'), interaction with the calling party is required to determine the appropriate new address (`referral number'). The scope of this standard includes: 1. SIP signaling for a call reaching an intercepted number in the NGN where all or part of the Intercept Service is provided by the Application Server associated with other terminating services for this destination. 2. SIP signaling for a call to an intercepted number in the NGN that is directed toward an application in the NGN, or in another NGN, which provides the Intercept Service.