asterisk users - Jul 2011 - IVR sound after dial sip

Hi, I have a ivr, and I need to make a beep sound playback after
phone when to dial sip DIALSTATUS} = $ {ANSWER
 example


1234,1,Answer()
1234,n,Dial(SIP/1234)
;When 1234 sip phone answer te
call, playback beep on this sip phone. 

how could I do this? 

thanks
for any help 

  
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