The CA may, in fact, be an 'outside' agency, but unless the original creditor has charged-off the account (unlikely), then they still own the debt. The tricky part is determining just what the relationship is between this collector and the original creditor. There is some verbage in the FDCPA that DOES apply to this type of collector but certain conditions must be met, and you would have to determine just what the situation is and how the CA got the account in the first place.
(This may be confusing, but here is an FTC Staff Opinion letter on exactly this situation -
http://www.ftc.gov/os/statutes/fdcpa/letters/demayo.htm)
A "Federal Bank" ?? Another load of baloney and pure hogwash ! As far as I know there IS no such thing outside of the Federal Reserve itself !! Who is the OC ? Who is this collection agency ?
Have you received anything in writing from the OC or the CA ?
They are making ridiculous threats to scare you into paying them, so don't waste your time talking to them, all you'll get is their BS anyway. The next time the jerk asks you if you have a lawyer, ask him/her exactly WHEN and WHERE you are being sued (what court). You can bet, at this stage of the grand collection game, they aren't ready to sue you, you're not THAT late and they still have time before it goes to charge-off.
Get a mailing address from them and mail them a letter, certified, RRR, in which you propose a payment arrangement that YOU can afford. They'll most likely reject it, they're not obligated to take anything less than what you agreed to in the card agreement, but at least it shows that you are willing to pay something until you can get back to where you can make your full payments.
Just stick to your guns and don't let them bully you into paying more than you can and don't EVER let them pressure you into giving out your bank info or force you into a post-dated check scenario.
Lastly, there is NO law, whatsoever, that says you HAVE to talk to these scumbags, so igoring their calls and letting them talk only to an answering machine is not a crime

and there's not a damn thing they can do about it !