If you want to get ooma dialtone from all your wall jacks inside your house on top of being able to plug in a Scout in any wall jack, do the following:
Use one of these (on the other side of this adapter, there is just 1 port instead of 2):

Plug the unplugged plug into the single port (take out the inline coupler), plug the Hub's wall port into 1 of the 2 ports and plug the Hub's phone port into the other port.
If you can't find one of the adapters above, just use these kinds but you'll still need the inline coupler connected to the uplugged plug.

A duplex splitter similar to this came with your ooma device; this will also work:
If you want to connect a phone to the Hub as well, just plug one of these into the phone port of the Hub so you can turn Hub's 1 phone port into 2.
By the way, where are those thick brown wires connected to your red & green screw terminals coming from?
Your NIB: