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This document provides a communication model that contains the requirements for a Vehicle Interface Protocol (VIP) to access a vehicle interface over a network transport protocol for AMI-C networks. It does not apply to networks that have pre-existing protocols and messages for transporting vehicle functions. A VIP defines how an application communicates over a simple network transport mechanism. These requirements can be applied to network technologies that use UDP/IP as the transport method. However, pre-existing systems may have unique protocols and messages for transporting messages about vehicle functions; therefore, this document does not cover such pre-existing technology. Messages transported are network-specific instantiations of the CMS. This document addresses the following aspects related to the AMI-C’s approach to network communication: ? message frame format; ? application transaction; ? system transaction; ? initialization process; ? address resolution; and ? functional module discovery and removal process.