О present document defines the requirements for the IMS Multimedia Telephony (IMS-MT) Service in a digital cellular telecommunications system, including GSM, UMTS, LTE and other 3GPP technologies. It specifies the functionalities, interfaces, and procedures necessary to support multimedia telephony over packet-switched networks. The scope covers voice and video calls, multi-party conferencing, call transfers, and other supplementary services within the IMS framework.
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