What version of PBX are you working off of? G3 series or S-series? If G3 version, perform a "change trunk group x" with x being the trunk group of your incoming circuit. On the third page, you will see incoming call handling treatment. The first column is service feature. Enter other on this line. Next column is called length. Enter 4 here. The third column is called number. Enter here the last 4 digits of your inbound DID you are routing. The fourth column will be delete digits. Enter a 4 here. The fifth column will be insert digits. Here you will enter the five digit extension in which you wish to route the DID to. Its the same procedure for S-series servers but you must do a "Change incoming-call handling treament Trunk Group x" command instead. Hope this helps. Good luck.