[asterisk-users] Inserting a pause with Sipura in between

[Joseph]

I've a problem with inserting a "pause" and dialing additional numbers
when going through  Sipura-3000

exten => _12,1,Dial(SIP/4751724 at pstn-5,30,D(wwwwww18))

D(wwww) doesn't work as it sends the DTMF tones right after FXS connects
to FXO; though, I want insert a "pause" and send additional numbers
after connection goes through FXO.

Is it possible?
-- 
#Joseph