You can use incoming digit conversion to re-direct one of the DIDs to another extension. Check the FCR_DATA in your CDB (LD 15) to verify or change IDCA to YES. Then, go into LD 49 and create a DCNO. You enter the DID that you want to re-direct, and the extension to re-direct it to, there. Then, go to LD 16 and modify the RDB, that your DIDs come in on, to IDC YES and DCNO/NDNO to the DCNO number created in LD 49.