suppressing outbound leg on ipipgw

[vignesh]

hello all 
i am using cisco ipipgw and free radius. for a single call i get 2
records. one for each leg. now i want to supress one of the leg mostly
outbound. i cant use gw-accounting suppress as both the legs are voip. i
even tried voice class aaa accounting suppress outbound leg but still no
luck any idea guys how can i do this. 
thanks in advance 

Vignesh