If you experience low video quality, for example, jitter, lowering the bandwidth may help.
If you know that more bandwidth is available than the amount set as the default, you can increase the bandwidth for better video quality.
This begs the question what is the default call bandwidth Jabber Video uses?
Your bandwidth configuration window looks different from the one at the top - only 512kbps Muximum. That may be an earlier version of Jabber video.
You can go to www.ciscojabbervideo.com to download the latest version.