You should probably give it a shot on newest release which is 1.6.17.

I'll check out the newer version of freeswitch to see if it solves the issue.

Why would you want to bridge another conference in, instead of just running the single conference? Doing so will allow you full access to all the controls for individual members. You could still do this back to back with freeswitch and asterisk by changing asterisk dial plan to bridge to the conference room on freeswitch for each member.

I have it set up so Freeswitch sends it to Asterisk instead of the other way around, as the Asterisk audio bridges are a completely separate feature. Bridging Freeswitch to Asterisk gives them the option of dialing into a video conference for the audio portion without having to change infrastructure a decent amount so that selectively some numbers go to Freeswitch and others Asterisk. I don't think it would be approved anyway to do that, partially due to infrastructure /routing changes for multiple servers, as well as the way video conference is billed versus the Asterisk conference rooms.