42.068: Voice Group Call Service (VGCS); Stage 1

Info Page @ 3GPP
Rel-13
v13.0.0
Rel-12
v12.0.0
Rel-11
v11.0.0
Rel-10
v10.0.0
Rel-9
v9.0.0
Rel-8
v8.7.0
Rel-7
v7.9.0
Rel-6
v6.1.0
Rel-5
v5.1.0
Rel-4
v4.2.0