v.29

from The Free On-line Dictionary of Computing (8 July 2008)

V.29

   <communications, standard> An {ITU-T} {modem} {protocol} which
   allows 9600 {bps} {half duplex} or {four wire} communications
   with {fall back} to 7200 {bps} and 4800 {bps}.  V.29 is used
   by {fax} machines.

   (2004-07-30)