Yes, you could connect a phone to it, or you could just leave it on its own.
If you are connecting the PHONE port of the ooma hub to your in-wall wiring, your house wiring is simply acting as a splitter so you can plug multiple phones into your ooma hub. Since each of these phones connects to the same physical "line" on the hub, you cannot take advantage of some premier features like the instant second line. You need a scout for this.
The scout is designed to talk to the ooma hub through the WALL port (not the PHONE port). If you were to plug a scout into a phone jack you would be connecting the scout to the PHONE port of the ooma, and it would not function. Depending on how your house is wired, you might be able to (with the proper type of splitters) use one twisted pair of wires for the phones connected to the hub and another twisted pair for the hub<-->scout "WALL" connection. This would allow you to put a scout somewhere else in the house for easy voice mail access. If you plug a phone into the scout, you could use that phone to access your second line.
Thanks for the feedback thus far. I will play around with the Scout in order to see what limited functionality, if any, is available by simply plugging it into an unused wall jack. From Carl's description it sounds as if it might be able to be used to check messages and provide some other low-level capability with the way I have the hub set up...?
jytkal- I currently seem to have a second line whenever I press "flash" on any of my cordless phones. Is your description of the instant second line different from what I (think) I have?
With Premier service and one number, you can connect a phone to the scout and use 2 lines with the same number.
If a caller is on the phone on the hub, you can pick up the phone on the scout and call out, as if you had a second number. (and vice versa)
Or if a second call comes in, instead of flashing over to the second caller, you can answer the call with the scout's phone.
I have the scout side by side with the hub and use them as a line one and line 2 from my desk.
Just so I am clear... the only way to accomplish a "true" second line (from one number) with a dry loop setup is to use a Scout? And that Scout must be plugged into either the Hub's "Wall" port or, if a splitter is used at the wall jack near the hub and those two wires are connected to the "Phone" and "Wall" ports on the Hub, possibly plugged into a different wall jack (I say possibly as viability may vary depending on how one's house is wired)?
In theory, this should work. Can't speak for it in practice...
No need to connect the Scout to the house wiring unless you are using ooma WITH a landline.
I would have liked to have my scout located in the kitchen so it would be easier for the family to see/check voicemail messages, but that would require wiring like I described earlier -- one pair of wires running between my office and the kitchen to connect the hub/scout WALL ports, and a second pair of wires to feed the scout's PHONE port back to my office for my 2-line phone. Wasn't worth the hassle just to get a flashing red light in the kitchen, so I taught the wife & kids how to check voicemail through the telephone handset by dialing our own number.