We have, I suppose, about one hundred IP-Phones installed at our customers, but I never saw such problem.
So, the phone writes “Configuring IP”, “Configuring CM List” and so on. Then it goes to TFTP server and starts to download appropriate s/w image and writes it to flash. As I understand, message “updating software” appears at this point.
1. Press Setting button and select Status – Status Messages. Is there something interesting ?
2. You may try to change default s/w image from CallManager. Maybe it is corrupted..?