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In this paper, we present the creation and characterization of an open source Internet Protocol Multimedia Subsystem (IMS) test bed. We built this test bed with the intention and motivation of doing research related to the performance of its various functional components as they cooperate to provide IMS features. The IMS specifications describe a set of functional components, the interfaces between those components, and the protocols and procedures to be used across those interfaces. The test bed is built based on the "Open IMS Core", which is an open source set of IMS functional components. We verify that the operation of the test bed is in conformance with the message sequence charts provided by the IMS standards. Moreover, we define four metrics that quantify the overhead associated with IMS implementations, and present the observed values of these metrics collected on the test bed under the conditions of no background traffic. This provides necessary and valuable data for us in order to study the performance when the test bed is under various background traffic loads.

A Study of An Open Source IP Multimedia Subsystem Test Bed