asterisk users - Apr 2006 - Voicemail() - Reading exit or return results

Here my script:

 exten => 230,1,Answer 
 exten => 230,2,NoOp 
 exten => 230,3,Voicemail(u${EXTEN}) 
 exten => 230,4,NoOp(Need results from VoiceMail() above - should be non-zero
and provided to ARG3)
 exten => 230,5,NoOp
 exten => 230,6,GoToIf($[${ARG3} = 0]?s|8) 
 exten => 230,7,system(/var/lib/asterisk/agi-bin/230.php|${EXTEN}) ;  
 exten => 230,8,Hangup 

I need to know how to read and use 'exit' results into ARG3 from
voicemail() so the script will continue past line 6 or not

Thanks

Bart
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