In a Mivoice Business Rel 8.0 new install, a clinic forwards their main number to an after hours location. If a call comes in after hours from an 843 area code the call is transferred correctly. If the call comes in from any other area code like 864 then the PBX replaces the area code of the "forward to call" and the call does not go through! There is an existing PRI and it has been trouble free for years???? Also the 843 area code is the correct area code for the PBX location and the after hours location as well.