24.147: Conferencing using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3

Info Page @ 3GPP
Rel-13
v13.1.0
Rel-12
v12.6.0
v12.4.0
Rel-11
v11.4.0
Rel-10
v10.5.0
Rel-9
v9.5.0
Rel-8
v8.5.0
Rel-7
v7.11.0
Rel-6
v6.9.0