Has anyone ever heard of IBM Lotus Sametime? We have an affiliate who
uses this and in the documentation from IBM talks about known
incompatibility issues with proxy servers but IBM does not list the names.

If you are familiar with SameTime, we are able to login and use the
whiteboard, chat, and web url options but we do not get the video feeds.
We have opened all the required ports (4 of them) on the firewall but it
appears that some traffic goes back to the outside NIC card on the proxy
server instead of original client IP.

Any suggestions would be nice.