Received this call and did not leave a message.  Caller ID indicated the provider as "Incoming Call" which my phone was already indicating.

Many Class From this number. No Message left.

I answered the call but didn't say hello. A male voice said hello then I hung up. I figured it was a sales call or donation call. Found it funny that Caller ID stated Incoming Call

I received a call this afternoon @ 2:43 pm,  my caller ID showed "Incoming Call" with the following # (415) 363-9645
I knew the Area Code call was from San Francisco and hesitated to answer since I know nobody from there. However after answering the call, there was total silence, I repeated my hello's a few times, then whoever was on the line just hung up.
I am on the "Do Not Call" list.
I checked the # on the web and found out that I was not the only person who has received calls from this # in San Francisco.
Please see if there is something you can do to stop this person or persons from calling without identifying themselves.
Not knowing the reason for the call in itself is suspicious.

Thank you for your time

Me too-  Same thing happened to me.