Dialtone on Remote NetLink'd Phones

[FortKnox]

I have a branch office that is NetLink'd to the the home office.
I have 2 POTS/CO lines at the branch office, and I need to disconnect them.

Can I point a DID at the home office to an extension at the branch office? I know how to, I just haven't tested it yet.

More importantly, how can I get PSTN dialtone on the phones at the branch office?
Can I setup a route or something to get their calls to go out the home office?
If a route or trunk is to complex for me, I thought about putting a 2-line Cisco ATA at the branch office, and have it registered to the switch at the home office.

Suggestions?

 

[belevedere]

What system is this?

 

[FortKnox]

SV8100