CID="Polling_Quest". They always hang up before leaving a message. Note that it IS worth it to block this number... some folks say it's not worth it as they will simply use a new number, which they may actually do... however this number has posts to it for a year now (from Jan 2016 to now, Jan 2017! Thus, this number has been repeatedly used for quite some time (although there may be gaps in time that it is not used), and is likely worth blocking. They (like others) totally ignore "Do Not Call" lists... the government really needs to get a grip on this abuse.