Audio issues outside of the network

So i put an IP address to solve the audio issue from extension calls from outside of my network. After, the problem was resolved and it was possible to have two-way communication

But when i tried to replace the IP address with the DNS, it did not resolve the right IP I received from this site. What do you think i should do here? Because if i do this, the problem comes back.

There seems to be some back history missing here. Is this a continuation of an earlier thread?

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