enable direct dialing on a2billing( disabled enter pin)

use_dnid=yes  , number_try=1 , play_audio=no

Note  need to disabled Caller Id Verification

CLID Enable	cid_enable	No	enable the callerid authentication if this option is active the CC system will check the CID of caller .	agi-conf1
Ask PIN	cid_askpincode_ifnot_callerid	No	if the CID does not exist, then the caller will be prompt to enter his cardnumber .	agi-conf1