add area codes to one extension only add area codes to one extension only lacnss (TechnicalUser) (OP) 21 Aug 07 15:09 I have a user who wants to restrict one phone to three area codes. Our RSM list gives to many area codes. Can you show me the EMML steps? RE: add area codes to one extension only stevei50 (Vendor) 26 Aug 07 20:50 Each extension has am RSM that controls the dialing capabilities based on the restriction group of the trunk group if direct accessing a TG or ARS. The command ASS RC,3,1,, RGN #, RSM #, code to be restricted.