Number of rings before 'missed call'

I use Nomorobo to help block calls. Although I realize my phone will ring once if Nomorobo blocks the call, it also puts a 'missed call' on my phone which I have to erase. Is there any option to not log a missed call until after a designated number of rings? If so, I could set to 1 ring and not have to delete all those Nomorobo blocked 'missed calls'.