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Spec	Title	Releases	WG
29.328	IP Multimedia (IM) Subsystem Sh interface; Signalling flows and message contents	18.2.0 17.5.0 16.3.0 15.10.0 14.8.0 13.12.0 12.15.0 11.18.0 10.15.0 9.16.0 8.18.0 7.13.0 6.15.0 5.16.0	C4

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