# Quelques recommandations de l'ITU-T
(extrait des intitulés)

V8 | Procedures for starting sessions of data transmission over the public switched telephone network
v21 | 300 bits per second duplex modem standardized for use in the general switched telephone network
V22 | 1200 bits per second duplex modem standardized for use in the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits
V22bis | 2400 bits per second duplex modem using the frequency division technique standardized for use on the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits
V25 | Automatic answering equipment and general procedures for automatic calling equipment on the general switched telephone network including procedures for disabling of echo control devices for both maually and automatically established calls
V32 | A family of 2-wire, duplex modems operating at data signalling rates of up to 9600 bit/s for use on the general switched telephone network and on leased telephone-type circuits
V32bis | A duplex modem operating at data signalling rates of up to 14 400 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuit
V34 | A modem operating at data signalling rates of up to 33 600 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits
V42 (MNP,LAPM) | Error-correcting procedures for DCEs using asynchronous-to-synchronous conversion
V42bis | Data compression procedures for data circuit terminating equipment (DCE) using error correction procedures