Can't hear other party over calls.

I am having 2 lines activated on my iphone XS. Xfinity Mobile(XM) is my primary line while Verizon is secondary line that i'm using through esim. Both lines activated since more than a year and so far not issue w.r.t calls. From past 2 days, i can't hear other person while call connected through XM. Similarly, other person can't hear me while call connected. This is continue happening for all calls irrespective to any specific service provider. However, i am keep receiving SMS and data services through XM. Also, when i do whatsapp or facetime calls, i can hear other person which rule out issue with my phone. I did my phone reset(Erase all content and settings) but problem still exist.