I need to know are there any prerequisites in applying security patches, like SR release etc. i did not find any release notes or readme files for the following hotfix of Call Manager 4.3 OS ver 2003.1.2a
If you are installing the patch executable only onto the current OS: win-K9-MS10-030-Windows2003-KB978542.exe - then you are good to go.
However, if you are installing OS upgrade which is a cumulative version of all previous patches and SR's: win-OS-Upgrade-K9.2003-1-5a-sr7.exe - then you need to meet the minimum pre-requisites listed in the tables below the info on the current vulnerabilties. In your case, your OS is outdated so you should get to the latest version of 2003-1-5a and then patch appropriately to get to the latest SR for that train. So, if you look at the second table - you can upgrade directly to 1.5a since you are on 1.2a. Then you can apply the SR once the base 1.5a release is installed.
Operating System Updates 2003.1.2/2003.1.2a End of SW Maintenance 17-Mar-2009
Knowledge Base Article
OS version 2003.1.2a
Yes, 2 times
About 30 min.
Yes. Up to 3 times.
About 30 min.
Requires OS 2003.1.1
win-OS-Upgrade-K9.2003-1-2a-sr21.exe OS Upgrade Service Release 21
Yes, you can apply it now. I recommend at least checking the Technet site (Microsoft) to see if there are any pre-req's that you need to install as well. If so, you'll need to look for the additional patches from Cisco via the links I already sent you and apply them in order.
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