Use public STUN server for my Asterisk server?

I have setup a asterisk server on a particulat URL.… for example.

Now, I am facing problems when I try to connect my client devices from my office router (the devices deregister after sometime), but it can connect using my mobile internet and it does not deregister.
So, the problem is maybe because of NAT ?
So, I figured out maybe setting up a STUN server would be a good idea.

I also came across this list : A list of public STUN servers,
Can I use one of these to do the translation for me to connect to my asterisk server ?