Who called from 3123270508

Have received a few calls from this number on my cell and it immediately hangs up when I answer

yeah i have gotten a few calls to and as soon as i answer they hang up wtf is up with it ?

I just got as call a couple of minutes ago from the same number..caller ID says "Broadvoice". They do have a website

I have gotten multiple calls from them today. I haven't answered any of them but when I call back I get the busy signal as well. I just set my phone to ignore any calls outside of my area code for now.

Broadvoice is the telephone company, they're not the ones making aclls.