This depends on which model dual 70 you have. The first generation versions only have two video outputs (they are basically Room Kit Plus's) so no. G2's, however, are based on Room Kit Pro and does have one available port.
Also note you posted this as a blog which is probably why you didn't get a response quickly. I suggest posting questions like this in the "Telepresence and Video Infrastructure" section in the future.
Thanks for your reply, this would be a new system presumably based on the Room Kit Pro.
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