Not receiving SMS over the network

Hi,

I have searched and not found what I am looking for.

I have a basic installation of a Mikrotik 2011u router for my office internet (Wifi and LAN).

My android cell phone has the WIFI calling option, so when I activate it, I can send/receive SMS over wifi, this is necessary as my LTE signal is close to null in the office.

But since I have installed this router, I am no longer receiving SMS when I am on wifi, as soon as I step outside and switch back to LTE then the SMS flow in.

I cannot find out why the router is not letting them trought, it worked flawlessly on mu ASUS and D-Link router.

Anyone can give me some piece of advice?

thank you

Eric

Are you unintentionally blocking it in your firewall?