​List of Recommendations under the responsibility of the respective ITU-T study groups and TSAG in the 2017-2020 study period, including reallocations decided by TSAG during the 2017-2020 study period

• ITU-T E-series, except those in conjunction with Study Group 17 or under the responsibility of Study Groups 12 and 16
• ITU-T F-series, except those under the responsibility of Study Groups 13, 16 and 17
• Recommendations of the ITU-T I.220-, ITU-T I.230-, ITU-T I.240-, ITU-T I.250-series and ITU-T I.750-series
• ITU-T G.850-series
• ITU-T M-series
• ITU-T O.220-series
• ITU-T Q.513, ITU-T Q.800 - ITU-T Q.849, ITU-T Q.940-series
• Maintenance of the ITU-T S-series
• ITU-T V.51/ M.729
• ITU-T X.160-, ITU-T X.170-, ITU-T X.700-series
• ITU-T Z.300-series

• ITU-T D-series

• ITU-T K-series
• ITU-T L.1 - ITU-T L.9, ITU-T L.18 - ITU-T L.24, ITU-T L.32, ITU-T L.33, ITU-T L.71, ITU-T L.75, ITU-T L.76, ITU-T L.1000-series

• ITU-T J-series, except those under the responsibility of Study Groups 12 and 15
• ITU-T N-series

• ITU-T Q-series, except those under the responsibility of Study Groups 2, 13, 15, 16 and 20
• Maintenance of the ITU-T U-series
• ITU-T X.290-series (except ITU-T X.292) and ITU-T X.600 - ITU-T X.609
• ITU-T Z.500-series

• ITU-T E.420 - ITU-T E.479, ITU-T E.800 - ITU-T E.859
• ITU-T G.100-series, except ITU-T G.160- and ITU-T G.180-series
• ITU-T G.1000-series
• ITU-T I.350-series (including ITU-T G.820/I.351/Y.1501), ITU-T I.371, ITU-T I.378, ITU-T I.381
• ITU-T J.140-, ITU-T J.240- and ITU-T J.340-series
• ITU-T P-series
• ITU-T Y.1220-, ITU-T Y.1530-, ITU-T Y.1540-, ITU-T Y.1550-, ITU-T Y.1560-series

• ITU-T F.600-series
• ITU-T G.801, ITU-T G.802, ITU-T G.860-series
• ITU-T I-series, except those under the responsibility of Study Groups 2, 12 and 15, and those having double/triple numbering in other series
• ITU-T Q.933, ITU-T Q.933bis, ITU-T Q.10xx-series and ITU-T Q.1700-series
• ITU-T X.1 - ITU-T X.25, ITU-T X.28 - ITU-T X.49, ITU-T X.60 - ITU-T X.84, ITU-T X.90 - ITU-T X.159, ITU-T X.180 - ITU-T X.199, ITU-T X.272, ITU-T X.300-series
• ITU-T Y-series, except those under the responsibility of Study Groups 12, 15, 16 and 20

• ITU-T G-series, except those under the responsibility of Study Groups 2, 12, 13 and 16
• ITU-T I.326, ITU-T I.414, ITU-T I.430-series, ITU-T I.600-series and ITU-T I.700-series, except ITU-T I.750-series
• ITU-T J.190 and ITU-T J.192 
• ITU-T L-series, except those under the responsibility of Study Group 5
• ITU-T O-series (including ITU-T O.41/ITU-T P.53), except those under the responsibility of Study Group 2
• ITU-T Q.49/O.22 and ITU-T Q.500-series, except ITU-T Q.513
• Maintenance of the ITU-T R-series
• ITU-T X.50-series, ITU-T X.85/Y.1321, ITU-T X.86/Y.1323, ITU-T X.87/Y.1324
• ITU-T V.38, ITU-T V.55/O.71, ITU-T V.300
• ITU-T Y.1300 - ITU-T Y.1309, ITU-T Y.1320 - ITU-T Y.1399, ITU-T Y.1501, and ITU-T Y.1700-series

• ITU-T E.120 – ITU-T E.139 (except ITU-T E.129), ITU-T E.161, ITU-T E.180-series, ITU-T E.330-series, ITU-T E.340-series
• ITU-T F.700-series, except those under the responsibility of Study Group 20, and ITU-T F.900-series
• ITU-T G.160-series, ITU-T G.190-series, ITU-T G.190-series, ITU-T G.710 - ITU-T G.729 (except ITU-T G.712), ITU-T G.760-series (including ITU-T G.769/Y.1242), ITU-T G.776.1, ITU-T G.799.1/Y.1451.1, ITU-T G.799.2, ITU-T G.799.3
• ITU-T H-series, except those under the responsibility of Study Group 20
• ITU-T T-series
• ITU-T Q.50-series, ITU-T Q.115-series
• ITU-T V-series, except those under the responsibility of Study Groups 2 and 15
• ITU-T X.26/V.10 and ITU-T X.27/V.11

• ITU-T E.104, ITU-T E.115, ITU-T E.409 (in conjunction with Study Group 2)
• ITU-T F.400-series; ITU-T F.500 - ITU-T F.549
• ITU-T X-series, except those under the responsibility of Study Groups 2, 11, 13, 15, and 16
• ITU-T Z-series except ITU-T Z.300-series and ITU-T Z.500-series

• ITU T F.744, ITU T F.747.1 – ITU T F.747.8, ITU T F.748.0 – ITU T F.748.5 and ITU T F.771
• ITU T H.621, ITU T H.623, ITU T H.641, ITU T H.642.1, ITU T H.642.2 and ITU T H.642.3
• ITU T Q.3052
• ITU T Y.4000-series, ITU T Y.2016, ITU T Y.2026, ITU T Y.2060 – ITU T Y.2070, ITU T Y.2074 – ITU T Y.2078, ITU T Y.2213, ITU T Y.2221, ITU T Y.2238, ITU T Y.2281 and ITU T Y.2291

NOTE – Recommendations transferred from other study groups have double numbers in the Y.4000-series.

• ITU-T A-series Recommendations