You can't restrict individual numbers from being blocked. But you can restrict individual extensions from accessing outgoing trunks through RSM/FRL/COS assignments. If you really know your stuff, you can also go into the ARSC and ARSR tables to enable/disable dialing to particualr area/office codes. But don't do this unless you are very familiar with the techniques as this affects your outsidee dialing acces system-wide. You can quickly make a mess of your outgoing dialing access. Should you decide to modify the ARS Tables, be sure to document them as they are before you make any changes, so that if a mistake is made, you can reprogram the tables to their original parameters.
Seeeeeya; G.W.North