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This is the ratified version of the IP NNI Profile Specification, published by the joint ATIS/SIP Forum NNI Task Force. The IP-NNI Profile Specification defines a reference architecture and specifications for both the protocol and media as it appears “on-the-wire” at interconnect points. The specifications reference commonly used IETF, 3GPP, and other related industry specifications and identify protocol extensions and capability information needed for all-IP telephony peering.