Calling using Wifi is not working in my work place . 
I tested network settings, changed SIM card , changed phone from iPhone 15 to 17 pro and still not working ,but only in work place . I contacted IT service at work , they did some test and didn’t find any blockage. WiFi Service signal is fine . I can’t call anyone, when I try to call nothing goes through but on the other side the person receives a  phone call from me but answering they can’t  hear me  and they are unable to call me .But I am receiving text messages . I even went to Apple Store , they did some tests , all is good. Any ideas ? It’s frustrating, I have kids in school, and school is unable to contact me if they need to .