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ETSI TR 122 973
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ETSI TR 122 973 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; IMS Multimedia Telephony service; and supplementary services (3GPP TR 22.973 version 14.0.0 Release 14)
standard by European Telecommunications Standards Institute, 03/01/2017
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Full Description
ETSI TR 122 973 defines the IMS Multimedia Telephony service and associated supplementary services for IMS. It aims to take account and build on the IMS capabilities already provided in 3GPP Release 5 and Release 6.The objective is to define the minimum set of capabilities required in the IP Multimedia Subsystem to secure multivendor and multi-operator inter-operability for the IMS Multimedia Telephony service and related Supplementary Services.
Close cooperation shall be sought with TISPAN. TISPAN requirements, as captured in [2], will be taken into account, and referred to where appropriate.
While the user experience for the IMS Multimedia Telephony service is expected to have some similarity to existing telephony services, the richer capabilities of IMS will be exploited.