To evolve smoothly to an all-IP network, investments in the multimedia marketplace need to be reusable for IMS-based multimedia services. An SDP, the core of Ericsson’s offering for the multimedia marketplace, provides an easy way for IMS applications to interact with legacy infrastructure and external partners. IMS can also interact with the SDP’s service creation and execution capabilities for legacy services, such as SMS, MMS, and locatoin-based services.