29.007: General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)

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
v9.1.0
Rel-8
v8.1.0
Rel-7
v7.4.0
Rel-6
v6.4.0
Rel-5
v5.14.0
Rel-4
v4.14.0
R99
v3.15.0