Not that the FCC gives a damn, but as a contester I do, a little bit.

The WM3O contest exchange example above is very accurate for many contest contacts.

So is this kind of exchange:

DX: QRZ DE PJ4T

ME: WB2WIK

DX: WIK?

ME: WB2WIK

DX: TU 599KW

ME: 599CA

DX: TU QRZ?

There was never a real exchange of callsigns anywhere in there. Happens all the time.