30th October 2007 at 07:13
#49313
pix
Guest
javed,
in fixed lines, the “called party” number is sent in real time to the switch, via frequencies. Each time a digit is typed, the switch receives the digit’s frequency right away.
in GSM, the number is sent in one unique message : the whole number is contained in the “CALL SETUP” message. Therefore there is no need to code the digits into frequencies.
regards,