[asterisk-users] AGI for authenticating calls with DTMF

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HI,
I am trying to write an AGI that will authenticate users befoer the call is
allowed to proceed. Befor you ask, i have tried using the authenticate()
function but it does not work for me as this function messes up call
accounting (authenticat() awayas awnseres the channel, thus causes CDR to
bill for 'ring' time). the AGI will
(1) playback a voice prompt over an unawnsered channel
(2) Read DTMF input form keypad
(3) use this numbers to authenticate/validate the numbers entered from a
pin-code list
(4) disconnect or complete the call based on the validity of the pin code
entered and confirm results with voice prompt

Any helpful resources would be appriciated.
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