RTS mode does work, as stated. Also, if you get stuck, you can always run SourceConnect like an ISDN session: Dialogue on channel 1, TimeCode on channel 2. You can accomplish this by adding an additional blank track to your session and inserting the TimeCode Generator plugin on the track. Make sure you adjust the frames on the generator plugin to match your settings and those of the receiving party!!! Once you do that, route the channel out a discrete output to SourceConnect, and you should be rolling. You may need to trim the output volume of the TimeCode channel down a few dB. I find that I often am at -6.
I do this weekly between my studio Montana and various studios in UK or LA.
Cheers,
jeremiah