Hi Joerg,This is what we used on Jabber 9.2.6:msiexec.exe /i \\%path%\CiscoJabberSetup.msi CLEAR=1 TYPE=CUP CERTIFICATE_VALIDATION=DISABLEWorked fine for us.  No documentation on this that I am aware of, just something we found out with a little digg...

If you run the install msi with "CERTIFICATE_VALIDATION=DISABLE" the client won't throw cert errors for the self-signed certificates.