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Spec	Title	Releases	WG
22.173	IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1	18.0.1 17.3.0 16.3.0 15.1.0 14.3.0 13.2.0 12.9.0 11.7.0 10.7.0 9.7.0 8.10.0 7.5.0	S1

All information on this page is aggregated from the 3GPP Specfication Status Report page.