08-24-2012 04:04 AM - edited 08-24-2012 04:04 AM
Thanks for your Post..!!
As of now, you can't block specific call from blackberry, either you can block all calls or none of the calls.
You may try to fulfill your required using 3rd party app, which you can find from below URL
or you may search app in your BlackBerry app world, named Phone warrior- its a free app.
Hope this will help you..!!