The present document specifies a client for the Multimedia Telephony Service for IMS (MTSI) supporting
conversational speech (including DTMF), video and text transported over RTP with the scope to deliver a user
experience equivalent to or better than that of Circuit Switched (CS) conversational services using the same amount of
network resources. It defines media handling (e.g. signalling, transport, jitter buffer management, packet-loss handling,
adaptation), as well as interactivity (e.g. adding or dropping media during a call). The focus is to ensure a reliable and
interoperable service with a predictable media quality, while allowing for flexibility in the service offerings.