Very poor upload speeds when using NC on a mac, and NC addresses are assigned by an external DHCP server.
The upload speed issue only seems to occur when NC addresses are outside of the local subnet of the SA interface, and for some reason when using external DHCP the NC changes the netmask to a /32. There's no issue with DHCP per se (aside from an issue with the secs field which is being fixed), it's just a possible/likely cause to trigger the speed issue.
Is there support of OS X Lion 10.7.3 and Safari version 5.1 on IVEOS 6.5?
What would be the recommended version to support OS X Lion 10.7.3 and Safari version 5.1?
no; this support is introduced in 7.1. for the best experience, 7.2 is your best bet
From lab testing, 7.2r1 does support Pulse Collaboration on OSX 10.7 including sharing the OSX screen; whereas 7.1r7 still causes a crash for the same scenario.
Now for OSX 10.7 to make it into the Supported Platforms list for 7.2