If internal calls are ok then you could use the MAXIMUM DIALED DIGITS or ARS MAXIMUM DIALED DIGITS form to create a COR that restricts the number of digits that are dialable on the trunks. If you set it to three at least 911 would be possible ( in some areas its required by law to allow 911 from all phones ).
Another option might be to interconnect restrict it form calling anything and everything from calling it. That way the phone is pretty much useless so people would not likely try to use it.
The single biggest problem with communications is the illusion that it has taken place.
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