Thanks for teh assistance @terziyski Arvind

Thanks @terziyski DMZ didn't work either - I think the VoIP device I'm trying to connect may have problem. I'll setup an FTP server on my computer to confirm that my router is following its NAT...

Thank you @terziyski What you have explained in your example is exactly how I've setup my NAT forwarding table. I wasn't aware that online apps would report a port closed if there was no active...

Thanks for the prompt response @terziyski I have a static/public IP address (103.165.xx.xx), which I'm able to access from beyond my local network. I've tested opening/closing ports using the Remote...

I have a static IP address on a PPPoE connection, but I have been unable to NAT forward any TCP/UDP ports for my VoIP device. I've setup the relevant rules that enable the relevant ports for the...