[from-external] ;BLOCK UNKNOWN NUMBER exten => _X.,1,GotoIf($["${CALLERID(num)}" = "asterisk"]?BlockUnknown) ;BLOCK BY ANI exten => _X.,n,GotoIf($["${CALLERID(num)}" = "123123123"]?BlockByANI) exten => _X.,n(BlockUnknown),Wait(1) exten => _X.,n,Playback(custom/blockUnknown) exten => _X.,n,Wait(2) exten => _X.,n,Hangup() exten => _X.,n(BlockByANI),Wait(1) exten => _X.,n,Hangup()