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Spec	Title	Releases	WG
24.183	IP Multimedia Subsystem (IMS) Customized Ringing Signal (CRS); Protocol specification	18.0.0 17.1.0 16.6.0 15.1.0 14.2.0 13.2.0 12.2.0 11.6.0 10.8.0 9.11.0	C1

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