In current versions, the following conventions are used:
â¢SCCP firmware-P003xxyyzzww.bin, where x represents the major version, y represents the major subversion, z represents the maintenance version, and w represents the maintenance subversion.
â¢SIP firmware-P0S3-xx-y-zz, where x represents the major version, y represents the minor version, and z represents the subversions.
â¢MGCP firmware-P0M3-xx-y-zz, where M is the third character. The major, minor, and subversions for MGCP are consistent with the SIP naming convention.
A protocol boot mechanism is used to select the firmware image. During the phone bootup, regardless of protocol, the first file requested is the OS79XX.TXT file. The OS79XX.TXT file includes a line that contains the image name of the protocol that you select to run. For example, the image should read P003xxyyzzww for SCCP, P0S3-xx-y-zz for SIP, or P0M3-xx-y-zz for MGCP.
The phone uses the first four characters in the image name of the OS79XX.TXT file to determine how to load the image. If the first four characters match, the universal boot mechanism is bypassed and the phone continues with its current protocol boot sequence. However, if the first four characters do not match (namely the third digit, which represents the protocol), the universal boot mechanism will attempt to load the new protocol image that has been defined in the OS79XX.TXT file.
Sorry man! I knew when I sent the answer that you would probably have seen all this before and that you would be very familiar with the naming conventions etc. I was really just trying to validate your thoughts (which were right on the money) and add any help that I could :)
The firmware can certainly be downgraded in CME. The same rules apply regarding signed and un-signed loads, that's about all you would need to worry about.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...