Ok I have the following on the Asterisk every minutes. Got SIP response 481 "Call Leg/Transaction Does Not Exist" back from 2XX.2XX.133.1XX. The user of this Sip phone is able to make calls and get calls. A Windows 2000 pro using MS Messenger! I loaded it on my PC as well and it does the same for my IP address! Is there some thing I need change on it!