New Problem- incoming calls automatically go to voice mail

[demanner]

I've encountered a new problem.  New calls to my iPhone automatically go to voice mail.  If that same person calls my number a second time, my phone rings.  How can I fix this so that new calls don't automatically go to voice mail?  The problem showed up yesterday on my old iPhone 4.  I replaced the iPhone4 today with an iPhone6.  The same problem occurs. For example,  I call my iPhone6 from my land line and the iPhone doesn't ring but immediately goes to voice mail.  If I immediately redial my iPhone from the same land line, the iPhone rings and doesn't automatically go to voice mail.  I never had this problem before, as far as I know.  How can I fix it?

[demanner · Accepted solution]

Solved it.  The Do Not Disturb setting got mistakenly turned on.