This document contains the introduction of the Stage-1@ Stage-2 and Stage-3 recommendations for the 3GPP2 All- IP Multimedia Domain. It includes an overview of the system elements and interfaces and lists the series of documents that provide the complete specifications for the core network portions of the MMD. Not all MMD entities and interfaces may be covered by this version of this series of specifications. The specific entities and interfaces covered by a particular version are identified in each of the individual specifications.