How to send dtmf in disa

i want to ask question
i have axsas number when i dial this number i put 9 and the number
and i want my freepbx call the number automatik 9 and the number when i press it in disa
for example
the axsas number is
when i dial my disa from my extention
i want the freepbx dial
18882169506 and after the call is answer automatik dial 9 and the number
i have sip trunk from flowroute