Blocking Linkus Cloud - firewall solution

Our free trial on Linkus cloud is ended long ago. And now we have very annoying Linkus mobile ringing when outside of office wi-fi network. I asked about this situation couple months ago, no help. 

So i decided to stop this at firewall

Data to gather:

1. Internal IPPBX ip-address 

2. External voip providers ip addresses (i have two)

3. External DNS servers ip-address if any ( in my case)

4. IP address to check firmware upgrades ( )

So.Now i block all connection originated from 1 that is not directed to 2,3 or 4

And no more mobile linkus ringing outside of office network.

One mobile linkus annoyance left - forced password change during first setup. Anybody knows how to disable it?


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