Blacklist Call on freepbx 2.2.0

I tried to use the black list call on freepbx 2.2.0. But the number to be listed only the full number, let say 021 7971234. What i need, instead of type all the numer to be black list, just enter like 021 xxxxxxx. So all the number after 021 will be blakc list. Any trick to make it happen? Thanks.