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SCTP is a new transport layer protocol extending the functionality of TCP with support for performance enhancing services such as multihoming and multistreaming. Unfortunately, an accurate mathematical model, able to approximate performance results, still eludes the research community. Previous models either fail to provide practicality, or are too simplified in their assumptions. This paper aims to circumvent these problems by developing an analytic model containing a higher degree of information. The result is a more accurate model that approximates the steady-state throughput of an SCTP session.