ITU-T (International Telecommunications Union-Telecommunication Standardization Sector) standard G.723.1 defines codecs for low bit rate speech. The bit rates are 5.3Kbps and 6.3Kbps and are rates employed in VoIP (Voice over IP) systems such as H.323 and SIP (Session Initiation Protocol).


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

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