I have a 7940 that recently began having a problem. It is exten 8420. In CallMgr 4.2 it is set to go to voicemail after four rings. Instead after its four rings it produces a busy signal. I thought there may be something wrong with the mailbox setup etc, so I changed the RNA target to a known working extension. Same result. After four rings, it produces a busy. No matter what I list in RNA or Busy fields, it goes to a busy signal. I have deleted the extension and re-added it.. Same result.. I have deleted the phone and re-added it same result. I noticed when adding the extension back in even after I deleted it some of the information was retained by CM. Is there any way of clearing that information out totally to be sure we are starting from scratch? I have compared this phone setup with others and its identical. Everything is setup as it should be. Please help with any ideas on why this may be producing a busy after it needs to go to its CFB or RNA targets....??