It would also be no surprise that no radio calls were received, as the pilots wouldn't be wearing radio headsets in HF airspace (you only put them on if you are called over SELCAL, or intend to transmit a position report.)
Depends on where you work I suppose. I and many of my colleagues wear those designer noise cancelling headsets out over the water. Also, a hand mike is readily available at each crew station. We normally have 121.5 in one VHF, 123.45 in the other and ACARS on the third one.
We have ATC on one HF, HFDL on the other one.