Why doesn't my phone ring when one of my contacts calls?

[AC Question]

my phone does not ring when one of my contacts calls.

The caller gets and answer that I can't come to the phone and to leave a message.
It just started yesterday.

 

[cabsco]

Re: my phone does not ring when one of my contacts calls.

You may need to provide the name and model of the phone for getting quick help here. There are lots if devices you know, and each differs in configuration.