H.320 H.320 is an standard recommended by the  ITU-T ( International Telecommunication Union )  for running Multimedia (Audio/Video/Data) over  ISDN  based networks. The main protocols present in this suite are  H.221 ,  H.230 ,  H.242 , for audio  codecs  i.e.  G.711 , and for video  codecs  i.e.   H.261  and  H.263 . H.320 is formally named as  Narrow-band  visual telephone systems and terminal equipment which specifies the  technical requirements typically for   videoconferencing  and  videophone  services. Narrow-band for this specification is described as bit rates ranging from 64 kbit/s to 1920 kbit/s. This channel capacity may be provided as a single B/H0/H11/H12-channel or multiple B/H0-channels in ISDN (Integrated Services Digital Networking ). H.261 is mandatory for any enhanced H.320 system with video capability.   If a visua...