I have the classic ringer setup on my phone.
I have set it up this way:
1 buzz(vibration) then ring all the way.
if I do not want to take that call I have plenty of time to see who's calling after the buzz so I press the sided volume button/s to temporary mute/disable the ringing tone.
strange is that it works with some callers and it doesn't with others. if I press that sided volume button once it should stop ringing. it does but after 2 seconds buzzes and rings again.(only on some numbers)
this is the only ringtone I use, no other customized profiles or ringtones...