No sounds from speaker when I was using handoff

I have a trouble about handoff:

There were no sounds from the speaker when I was using the handoff feature answering a phone call from my iPhone.

At present, the only solution is that: "system preference setting" -> "sounds" -> "input", and change the input method from "built-in mic" to another input method, and change it back to "built-in" again, then the issue will be solved. but this solution is just a temporary solution. when I answer another call, It will recur again.

followings are my device detail info:

MacBookPro (Retina 13-inch late 2013)

Mac OS X 10.13.1

iPhone 7 128G

iOS 11.1