H.221 is a framing recommendation and is part of the ITU-T (International Telecommunications Union-Telecommunication Standardization Sector) H.320 video interoperability standards. It specifies the framing employed during synchronous video operation over individual ISDN (Integrated Services Digital Network) B channels ganged together into a 384Kbps H0 channels.


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

Explore NetX today with a
free trial.
More Info about NetX