OK I should have stayed with my first thought and talked about restrictions. If you look at restriction filter 01 (by default not used by anyone but preset with the following restrictions)
Filter Restrictions (denied) Overrides
01 01: 0
02: 1 001: 1800
002: 1877
003: 1888
03: 911 001: 911
04: 411
05: 976
06: 1976
07: 1••• 976
08: 1900
09: 1••• 900
10: 5551212
here filter 01 restriction 01 keeps the restricted phones from dialing 0
filter 01 restriction 02 keeps them from dialing anything starting with a 1 overrides 001 002 and 003 allow toll free dialing so If you use this fillter you would need to add 866 855 etc.
restriction 03 is there to make sure that whatever else you do even a restricted phone can dial 911
restrictions 04, 05, 06, and 08 are pretty obvious.
Restrictions 07 and 09 are there to restrict any area code followed by the 976 or 900 office code office code
and finally restriction 10 keeps the restricted phones from dialing directory assistance (lcally)
the whole restriction as shown is a basic local/toll free call only allowance so with that in mind you may want to modify it some. pull restrictions 01 and 02 (turn on long distance) while leaving the rest in place (the area where most larger systems see unwarranted phone calls. you may want to pull the restrictions 04 thru 09 if your company needs to be able to make these style of calls but remember that as you modify by removeing a restriction the restriction numbers change to fill up the just cleared number. so if you are going to clear a few at a time start with the higher numbers and work down.
Restrictions are found at **config Terminals & Sets->restrictions->Restriction filters->show filter->
JerryReeve
Communications Systems Int'l
com-sys.com