I'm about to try and make contacts with other hams through the ISS Packet
I watched the traffic and there's all kinds of stuff being sent.
I was thinking that a clean and short contact would be something like this:
N9KT>CQ,ARISS::CQ de N9KT - EM69
W9IMS>CQ,ARISS::N9KT :W9IMS - EN11
N9KT>CQ,ARISS::W9IMS :QSL and 73 via ISS
Or for the very shortest: