| In force components | 
| Number 
 | Title | Status | 
| T.38 (11/15) 
 | Procedures for real-time Group 3 facsimile communication over IP networks | In force 
 | 
| 
 | 
| Superseded and Withdrawn components | 
| Number 
 | Title | Status | 
| T.38 (06/98) 
 | Procedures for real-time Group 3 facsimile communication over IP networks | Superseded 
 | 
| T.38 (1998) Amendment 1 (04/99) 
 | Revised Annex B on establishment procedures for facsimile communication over IP networks | Superseded 
 | 
| T.38 (1998) Amendment 2 (02/00) 
 | New Annexes D (SIP/SDP Call Establishment Procedures) and E (H.248 call establishment procedures) | Superseded 
 | 
| T.38 (1998) Corrigendum 1 (03/00) 
 |  | Superseded 
 | 
| T.38 (1998) Amendment 3 (11/00) 
 | Clarification of protocol version numbers, support for TPKT headers and transmission of DTMF over RTP, and updated support for Internet-Aware Fax devices and H.248.2 Never published, directly consolidated in ITU-T Rec. T.38 (03/2002). Only the electronic prepublished version is available on ITU Website
 | Superseded 
 | 
| T.38 (1998) Amendment 4 (07/01) 
 | Clarification on use of T.30 Indicator and TCP start-up, update of Table 2, deletion of ASN.1 in Annex B | Superseded 
 | 
| T.38 (03/02) 
 | Procedures for real-time Group 3 facsimile communication over IP networks | Superseded 
 | 
| T.38 (2002) Corrigendum 1 (07/03) 
 | Never published, directly consolidated in ITU-T Rec. T.38 (04/2004). Only the electronic prepublished version is available on ITU Website
 | Superseded 
 | 
| T.38 (2002) Amendment 1 (07/03) 
 | Support for half-duplex V.34 and V.150.1 interworking Never published, directly consolidated in ITU-T Rec. T.38 (04/2004). Only the electronic prepublished version is available on ITU Website
 | Superseded 
 | 
| T.38 (2002) Amendment 3 (01/04) 
 | Appendix V - T.38 implementation guidelines Never published, directly consolidated in ITU-T Rec. T.38 (04/2004). Only the electronic prepublished version is available on ITU Website
 | Superseded 
 | 
| T.38 (2002) Amendment 2 (04/04) 
 | Support of RTP, version negotiation, insertion of "No signal" Never published, directly consolidated in ITU-T Rec. ITU-T T.38 (04/2004). Only the electronic prepublished version is available on ITU Website
 | Superseded 
 | 
| T.38 (04/04) 
 | Procedures for real-time Group 3 facsimile communication over IP networks This edition is a consolidation of ITU-T T.38 (2002), Cor.1 (07/2003), Amd.1 (07/2003), Amd.2 (04/2004) and Amd.3 (01/2004) without further modifications
 | Superseded 
 | 
| T.38 (2004) Amendment 1 (01/05) 
 | Addition of vendor information in SIP/SDP call setup, corrections to Annex C and Annex D, and enhanced implementation guidelines | Superseded 
 | 
| T.38 (09/05) 
 | Procedures for real-time Group 3 facsimile communication over IP networks 
 | Superseded 
 | 
| T.38 (04/07) 
 | Procedures for real-time Group 3 facsimile communication over IP networks | Superseded 
 | 
| T.38 (09/10) 
 | Procedures for real-time Group 3 facsimile communication over IP networks | Superseded 
 | 
| T.38 (2010) Erratum 1 (04/13) 
 |  | Superseded 
 | 
| T.38 (2010) Amendment 1 (10/14) 
 | New Appendix VI, clarifications and corrections | Superseded 
 | 
| T.Imp38/T.38 (02/00) 
 | T.38 Implementor's guide | Superseded 
 | 
| T.Imp38  (03/11) 
 | Implementors Guide for ITU-T T.38 (Procedures for real-time Group 3 facsimile communication over IP network) | Superseded 
 | 
| T.Imp38 (05/2012) 
 | Implementors Guide for ITU-T T.38 (Procedures for real-time Group 3 facsimile communication over IP network) | Superseded 
 |