What IP's URL's does 3CX require access to to operate correctly.

[princer800]

Is there a list of IP's or URL's that can be used to veriy that 3CX has proper access to for operation?
Setup for port forward and Firewall is weel documented for Inbound, but not outbound that is required.
It can also be considerd a "WhiteList" for companies that only providewhite listed access.

From time to time we run into a customer site that were we don't have complete access to the firewall configuration. 3CX should maintain a published list of Internet locations that must be accessible from the 3CX PBX.
It would be nice to actually have the FIrewall test have an optional test to verify those IPs/URLs.
Alternatively - failure to access them could be considered as warnings instead of hard failures.

 

[leejor]

Most installations tend to be more concerned with blocking inbound connections/ports. If a DNS lookup can be done, it's expected that there will be a connection allowed. I can't recall seeing anything specific for outbound traffic.

 

[cobaltit]

So while I do agree 3CX should maintain a list pretty much all of the information is here:

https://www.3cx.com/docs/manual/firewall-router-configuration/

They don't list specifically the domains they reach out to by I think that's by design. For example I don't know if webmeeting.3cx.net is correct or the only FQDN. There's also this:

https://www.3cx.com/user-manual/video-conferencing/

But if you allow all of the ports listed you shouldn't have any issues.