Problem solved, thank you.
I just wonder why I can put only 10 characters into the "Restrict Numbers that Begin with e.g. (6,8,9)", If I would need to allow dialing only to extensions 14xx, if I'm not mistaken, I would need to put "0,10,11,12,13,15,16,17,18,19,2,3,4,5,6,8,9" but is is already 42 characters.