I think you have misunderstood what i meant.
the installed system does know the fqdn as it's listed on the dashboard page under information FQDN. eg. FQDN = example.3cx.co.nz
the issue is if you log into the phone system via the local network using the systems ip address for example lets say 192.168.1.1:5001 then this is what happens.
under the click2talk you get: your click to talk is:
https://192.168.1.1:5001/callus#testcallque
BUT if you have logged into the web manage with example.3cx.co.nz:5001 now under the same click to talk you will get the correct item to cut and paste of
https://example.3cx.co.nz:5001/callus#testcallque.
So what I am trying to point out to you is it should really be giving you the correct cut and paste no matter which way you login to the web manager.
does this explanation make things clearer?