This is a very good question that Brian is raising.
My thought is, are these physical/audible calls or the Spirit leading the hearer?
What are your thoughts?
There are two major calls that have eschatological importance.
6 “And at midnight a cry was heard: ‘Behold, the bridegroom is coming; go out to meet him!’ (Matthew 25:6)
4 And I heard another voice from heaven saying, “Come out of her, my people, lest you share in her sins, and lest you receive of her plagues. (Revelation 18:4)
How are we to hear these two calls?