Asterisk call to client, privacy warning before talk

A() - wav file to play callee
m - play moh to caller while play message to callee 

exten = _00XXXXXXXXXX,1,Verbose(1,"Call out with warning ${EXTEN} from ${CALLERID(num)}")
    same => n,Dial(sip/8${EXTEN:2}@provider,300,mA(announce/outwarn))
    same => n,Hangup()