The world of telemarketers is growing at a fast pace as the FCC does a poor job or prosecuting telemarketers.
When you call and don’t leave a voice message, there is a good chance that you will not get a call back even when your caller ID shows up on a telephone.
Your call cannot be that important if you can’t take 10 seconds to leave a short call-back message.
If you do not leave a message, my assumption is that a telemarketer is calling and you don’t get a call back.