I've got 70 7960 phones that all reset to P0S3-8-12-00.loads SIP load suddenly, yesterday they were working fine today all on SIP firmware with registration rejected. I am running CUCM 11.5SU8 wonder if there is a bug or something that caused this.
Does anyone remember how I convert them back to SCCP? Do I need to upload a OS79XX.TXT to my CUCM TFTP and put in the SCCP load like P00308000500 or P00308010100? And will that convert the phones back to SCCP? Its been yrs since I worked with old 7960. Thanks any help much appreciated
