A new study from Disruptive Analysis says that while the mobile industry focuses heavily on IP Multimedia Subsystems (IMS) in the core network, it has largely ignored the requirements on the handset side. As a result, the firm has forecast that IMS functionality will only reach 20 percent of the market in 2009 and even then will be limited because of the shortage. While infrastructure standards are well established for IMS, only the most basic technological enablers for phones has been agreed upon, the firm said. There isn't a consensus on how to create the user experience for IMS phones, nor the ways in which applications interact with each other on the device itself. Most of the visions for IMS require phones to multi-task, a function only achievable by top-end smartphones today. Disruptive concludes that these issues will lead to a delayed development of the handsets and will result in an early focus on carrier-specific proprietary implementations. Release