Caller hangs up without leaving message when answering machine comes on.  I do not answer calls that I do not know when number shows up on our caller ID.

Calls but no message.

Calls constantly day and night even when sleeping.

They do not talk even when you say hello repeatedly.

I have requested them not to call again but who knows if anyone heard my request.

constantly calling with no answer when I say hello.

When I see the 800 number on the caller ID my suspicion level goes up. When I answer if I get no reply within a couple of seconds I always hang up.  Where's Tom Mabe when we need him?
If this is Outreach Associates (whoever they are) I received another call just like this earlier this week from a different number that research showed was that name.  I handled it like all others - if they can't respond to my "Hello" within 2 seconds, they're listening to a dial tone.

I receive calls from this number several times a day, and now for several days.
I let the machine pick up, and they never leave a message.

Usually I don't pick up (no message left). This time I did. Silence, then disconnect.

called and almost immediately an UNKNOWN call followed.

Called, then hung up. I got the blank message.

This number calls and never leaves a message, it is infuriating to dig the darn phone out of my purse and not have a message.  WHen I return the call, I get a voicemessage saying it is some fundraising organization.  I have asked repeatedly to be removed from their call list, and given them the number to remove, but to no avail.

Caller did not leave message.  Assume it is some sort of tele-marketer.

Caller did not respond to my "hello" right away. He asked if a certain person lived here, which he does not. Then another person, again negative. Then he thanked me and hung up.

Caller as for a member of the house - identified as calling from Consumer Reports.  I reported this on the donotcall.gov website.  Apparently they are pretending they are a number of organizations.  When I dialed the number back the message was Hi, You have reach Donor Services at Outreach Associates, the nation's premeir telefund organization and asks that you leave a message.

saw this on my caller id.

All I got was music and no said anything. I don't know what their purpose is.

Called, asked for oldest resident of my house, said they were the FCC and to call them back.

Just played a brief burst of music. This is obviously some nut job with no other life. As for the Hillary Clinton comment above, it is probably a way this screwball wants to take votes away from Senator Clinton.

Caller asked to speak with me or my husband, by name.  I identified myself and asked how I could help them, and they hung up.

Caller did not respond to my "hello" right away. After asking if I were I, I asked who she was. She responded with a name.  I asked "In regard to what?"
She replied , "The Hillary Clinton campaign."