Problems with Wi-Fi calling

When I come to the hospital to get my treatments I put my phone in airplane mode since I don't really get cellular signal in here. I turn on my Wi-Fi and it shows VZW Wi-Fi. The problem is when someone calls me they can't hear me but I can hear them. If they call back then it works fine. If I call out it works fine. Any suggestions?

 

The one time I didn't put it in airplane mode it was the same thing. The first time someone calls me they can't hear them but I can hear them. They either have to call me back or I called them.