Reverse playback channel

I have a ivr
exten => s,1,Answer()
exten => s,n,WaitExten(10)
exten =>_09XXXXXXXX,1,Dial(iax2/testing/${EXTEN},60,A(beep))
I need send the beep sound to a caller on answer , with the A(x.gsm) send sound to a called number
y try with a macro M(freq,${s})

exten => s,1, PlayBack(beep)

but the sound send to called number

any idea?