If its been hit by lightening it could be worth reinitializing the toll restriction programming in prg 90 and starting again.
If you are going to stick with class 4 then you need to check the allowed codes in prg 46 table 4 then 4# to display the STD codes or prg 46 table 4 then 8# to display local codes. I'm not too sure of the numbering scheme in the States but on the DK16 here its code 6 in prg 45.1 to set the defaults.
If your still struggling reply with the allowed codes you find in prg 46 and we can work it back from there.