| Superseded and Withdrawn components | 
| Number 
 | Title | Status | 
| T.Imp120/T.120/T.134/T.135/T.136/H.282 (01/04) 
 | Implementors' Guide for Recommendations of the T.120 System ("Data protocols for multimedia conferencing"):T.120 Series, T.134, T.135, T.136, and H.282 | Superseded 
 | 
| T.Imp120/T.120/T.123/T.124/T.126/T.127/T.135/T.136/T.137 (11/06) 
 | Implementors’ Guide for ITU-T Rec. T.120 and T.130 sub-series (Data protocols for multimedia conferencing):
T.126, T.127 and T.135 | Superseded 
 | 
| T.136 (05/99) 
 | Remote device control application protocol Since ITU-T H.281 is the protocol used by all shipping video conferencing products, including those using SIP and H.323 as call signalling protocol, it was decided to delete on 2010-02-12 the unused Recommendations ITU-T H.282, H.283 and T.136 in order to avoid any confusion
 | Withdrawn 
 |