It is done using restriction tables which IIRC are set to 02 by default on the sets. There is a prebuilt restriction table of 01 that can be used to block LD. The recommended method is to copy that table to another, say 90 for example, and edit and use that one. FYI, that table also restricts 0 and 411 I believe and possibly some other so look it over and remove what doesn't apply. Also don't be alarmed by the 911, there is an exception to it as well so it can be dialed. You will need to add 866 as an exception to the 1 restriction as well. Hope this helps.
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