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The 3GPP IMS is a next generation network architecture aimed at bringing the features and rich services of the Internet to the telephony world. Traditionally telephony products are developed by large companies with access to the proprietary solutions required for PSTN products. However, the shift to a packet-switched architecture and open Internet protocols has increased the developer base to include the huge community of web-developers.Consequently there are currently several open source software projects that aim to provide proof-of-concept implementations and research tools for promoting the development and adoption of IMS technologies. This work investigates the tools created by four open source IMS projects and incorporates these tools into a practical IMS test-bed framework. Evaluations are performed that demonstrate the capabilities and limitations of these tools in providing rich services to IMS users.

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