If you have a question about R&R (no, not Rest and Recreation,  but Rules and Regulations) by FCC, here is a quick link to get it from the horse’s mouth.

http://www.access.gpo.gov/nara/cfr/waisidx_10/47cfr97_10.html

I was remembering a rule in the past, that if you had contact
with a DX station, you were required to send both your and  his / her call, not just yours, when IDing. I do not see that requirement in the current part 97.

Finn WB2UWU