22.173: IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1

Info Page @ 3GPP
Rel-14
v14.2.0
Rel-13
v13.2.0
Rel-12
v12.9.0
v12.8.0
Rel-11
v11.7.0
v11.6.0
Rel-10
v10.7.0
v10.6.0
Rel-9
v9.7.0
Rel-8
v8.10.0
Rel-7
v7.5.0