(RADIATOR) How do filter accounting-stop packets

[nps12a]

Hi,
When I use AS5300 for VoIP,
I always get 2 stop-acoounting packet.
Only one gets av pair: 
 cisco-h323-call-type = "h323-call-type=Telephony"
that accouning-stop has correct session time, how do I ignore the other stop-accounting?

I read the voip.txt under goodies directory, but some commands that I couldn't find out from radiator reference manual: 

          finish($rv_accept)
                 if ($inav{'Acct-Status-Type'} ne 'Stop');

Anyone help me?
Best regard
Kaiser
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