Problem with the continuity function.

I have an iphone 6s and an ipad pro, both updated with ios 10.3.1. If I have the active function "make and receive calls on the ipad through the iphone" sometimes I answer the call, the time counter starts as if it had the normal call, but I can not hear anything. This problem occurs when you receive or make a call. I have this problem since ios 9.

 

good afternoon,
After all the above problem is caused by wifi. When there is a failure, if you disconnect the wifi, the problem is resolved immediately ...