[Asterisk-Users] Delay in Zap Calls?

[Kannaiyan Natesan]

I have this line in my extensions.conf,

exten => _393.,1,Dial(ZAP/${EXTEN:3},20,tr)

when I make a zap call, it gives me two rings and then makes the zap call.
Is there is a way I can make the call immediate?

Kannaiyan