Settings

[Rod123]

How to turn off silent mode automatically when I get a call so I can hear the caller ring?

 

[Endercraft]

Either one of these actions should do.

You can use the Call Incoming trigger to turn off when receiving the call.

 

[MacroDroidDev]

It's usually too late at the point the call is being received, because the ringer volume will not change. Instead you can do something like use the play sound action on the alarm channel to alert you.