Voice command for "answer," "hang up" or "end call"?

After looking thru Sprint's instructions, I do not see any voice command for "hang up" or "end call." I've tried these, and "stop," "shut up," "go away," "end." Voice command doesn't recogize these. Nor does voice command recognize "answer" when the phone rings. Should I say, "answer call"?
I was trying to do ASR's "adapt system to your voice," but my wife yelled for me to stop, it was driving her crazy.  After I get that done, maybe my Moment will be more responsive.