The document outlines a workshop on IMS (IP Multimedia Subsystem) market status and case studies. The workshop aims to provide an independent status report on IMS deployments to help industry understand where operators are with IMS and their likely network evolution paths. Case studies of Verizon, China Mobile, Vodafone Spain and an APAC operator will review their IMS activities. The workshop is divided into sections on IMS essentials, a global IMS market survey, operator case studies, and conclusions.