Avoid attended transfer

sorry for my english !!

I want to avoid a attended transfer (how ?)

my features.conf is:

[general]
parkext => 70 ; What ext. to dial to park
parkpos => 71-90 ; What extensions to park calls on
context => parkedcalls ; Which context parked calls are in
parkingtime => 120 ; Number of seconds a call can be parked for
; (default is 45 seconds)
transferdigittimeout => 30 ; Number of seconds to wait between digits when transfering a call
courtesytone = beep ; Sound file to play to the parked caller
; when someone dials a parked call
;xfersound = beep ; to indicate an attended transfer is complete
;xferfailsound = beeperr ; to indicate a failed transfer
adsipark = no ; if you want ADSI parking announcements
;findslot => next ; Continue to the ‘next’ parking space. Defaults to ‘first’ available
;pickupexten = *8 ; Configure the pickup extension. Default is *8
;featuredigittimeout = 500 ; Max time (ms) between digits for
; feature activation. Default is 500

[featuremap]
blindxfer => #1 ; Blind transfer
;disconnect => *0 ; Disconnect
;automon => *1 ; One Touch Record
atxfer => #2 ; Attended transfer

what DTMF sequence is possible ?

thank you for help !!!
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