HI Woodro,
Remember, N11 codes like 411 are NOT NXX codes and are handled in the SPN table per my previous reply. Now in the case of the 555 codes, these are definitely NXX codes, so all the rules etc. would apply. There are several ways to restrict NXX codes depending on the overall structure of the routing lists and tables that make up the dialing plan for the switch or your Exchange or Rate area. For example, here in southern California, with all the area codes many local and zone calls are 10 digit dialed calls. So depending upon what calls the customer wants to allow or restrict will determine some of the choices you would use in building the tables. Our local directory assistance is 411 within the home NPA, but all other DA in California or outstate is reached by 1+NPA+555-1212. Some areas in other states use 555-1212 without an NPA. For the purposes of pbx routing you can't lump "411" and "555" together. So you have the "DENY" field in the LD90 NPA tables and you have Route List Indexes, FCAS, DMI, etc using LD86 & LD87 to build whatever will work for your situation. Of course all your 7-digit NXX codes would go in NXX tables in LD90. You can really get elaborate if you need to!
In reply to your specific question, you would probably use the DENY "555" in the NPA table of LD90 and "OUT" 411 in SPN. You can also control this by NCOS and FRL.
One practice I don't do here is build an NXX table in LD90 with every NXX, 200-999, because you don't know what exchange will be assigned to future codes. One other thought is that here in California we have permissive 1+NPA+NXX-XXXX dialing and the possiblity of OVERLAY NPAs.....
Food for thought....hope this helps!
......JIM......