IP Multimedia (IM) Core Network (CN) subsystem inter-UE transfer (IUT) provides the capability of continuing ongoing communication sessions with multiple media across different user equipments (UEs) under the control of the same or different subscribers@ and as part of Service Continuity (SC). The present document provides the protocol details for enabling IMS inter-UE transfer based on the Session Initiation protocol (SIP) and the Session Description Protocol (SDP). The present document is applicable to User Equipment (UEs) and Application Servers (AS).