I have a CS1000E with beta 7.5 software. I built a SIP phone on a 1220 telset and I was able to login and make and receive calls. When I tried to add an appearance of another DN to my phone (doesn't belong to anybody else), I cannot login the new number and get a 404 not found message. Is it because the new DN is not a PDN on a separate TN that will give it a unique SIPU (SIP user name)?