Scammers don't let the phone ring more than 3 times, they don't want their number logged on your caller Id.  If you set your answering machine to answer on the first ring, you will spook them into hanging up quickly.  Legitimate callers will leave a message.

Same here no voice message and I don't answer unknown #

Got a call from 325-307-5508.  I don't answer calls where I don't recognize the number/area code. Called at approx. 8:10 on a Wednesday evening.  No message left.

Did not answer. Do not know anyone from this area code.

Called 4:10 pm on Good Friday afternoon. No msg. Caller ID showed only the number, which might be spoofed. We don't answer unknown numbers.