If you only have 3 classes, I assume you set this via command 11, if so then you select the area codes to deny in command 12, if you have set class 3 then it will deny all codes in locations 00-09
For Dial(12)--Toll restriction Area code selection.
In book writes that all area codes except those entered here will be denied, but this can not be done!!
My manual says:
"Area codes programmed will be denied. All extensions programmed for Service Class Selections shall be assigned to the same area code selection plan. Memory locations 00~04 are effective to class 2 and 3, Memory locations 05~09 are effective to only class 3
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