MatthewM,
Your solution may/may not be this simple. According to the NANP PL-174 your NPA 262 allows 7 and 11-digit local (HNPA) calling. The fix outlined would only affect users dialing 1262.
I don't have a reference for local vs. extended vs. long distance calling area from your PBX. If all 262 numbers are local, no problem. If some are extended or long distance you'll have to identify them in order to route/deny them properly. You may have to build an RHNPA table.
The Planing Letter mentioned something about local approval of 10-digit dialing. This is something else to consider.
Sorry, if this gets more complicated. We've got seven local NPA's and have a mixed 7/10-digit local calling area. I worked through this the hardway (trial and error).
Thanks, WHCARon