The Erlangs and IP Bandwidth Calculator has six entry areas. The top three areas (Coding algorithm, Packet duration and RTP header compression) are drop down boxes which are used to select the characteristics of the VoIP transmission. The bottom three boxes (B.H.T., Blocking and Bandwidth) are used to enter and display the calculations.
See also
Introduction to the Erlangs and IP Bandwidth Calculator
Starting the Erlangs and IP Bandwidth Calculator