I am attempting to share one extension (2001) on both SIP and SCCP phones using call manager express. 7940 (SIP): with 2 lines1. ext. 20012. ext. 2003 7965 (SCCP): with 2 lines1. ext. 20012. ext. 2004 IPC (SCCP): with 2 lines1. ext. 20012. ext. 2005 ...