Yes, you can convert them back to SCCP phones, you just need to follow the process at the url I provided above. Basically you're going to place a 0S79XX.txt file in your TFTP folder, and in that file you will specify the sccp image you want to use (without the .bin or .sbn extension). The phone...
Sounds like your 7940 and 7960 have been previously converted to SIP phones and are requesting SIP firmware files from the TFTP server. CallManager doesn't normally have those files in the TFTP directory, and that is why you are having issues. You will have to convert them back to SCCP (Skinny)...
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