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Definition - What does Network-to-Network Interface (NNI) mean? A network-to-network interface (NNI) is a physical interface that connects two or more networks and defines inter signaling and management processes. It enables the linking of networks using signaling, Internet Protocol (IP) or Asynchronous Transfer Mode (ATM) networks. A network-to-network interface is also known as a network node interface (NNI).
ANI (Automatic Number Identification) ANI (Automatic Number Identification) is a service that provides the receiver of a telephone call with the number of the calling phone. The method of providing this information is determined by the service provider (such as AT&T, MCI, Sprint, and so forth).