STUN Binding Request toward pi-hole.

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Hi,

My primary local DNS is 192.168.1.4 (pi-hole) and secondary router's interface (192.168.1.1).

I was investigating some Whatsapp call issues on my wife's iPhone and noticed something weird in tcpdump (was taken on AP). Please see below:

https://drive.google.com/file/d/1Df6I...

It looks like the iPhone quite frequently sends STUN Binding Request towards pi-hone. Is it expected?

Just want to know if it's normal even if nothing to do with the actual issue.

Thanks, Myky