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Solved
Port Forwarding Problem
Hi everyone, I am having trouble with port forwarding on my Netgear Nighthawk X8 (R8500) wireless router. It is currently running the latest firmware version (1.0.2.94). I have a Cisco 7960 ...
I performed a test using my computer with a softphone to see if the port forwarding was working at all and it did in fact work. So at this point, it looks like it is the IP telephone that is the problem. According to the configuration, it is listening on port 5060, but for some reason it is not passing the port test. At least I know at this point that the port forwarding rules in general are working.
Is your Nighthawk connected to a modem or a modem/router?
It is connected to an Arris SB6141 modem only device. This modem is mine and not supplied to me by the ISP.
Ok. Are you sure that port 5060 is the only port that needs to be forwarded and that only UDP? Try forwarding both TCP and UDP.
You can also try toggling the SIG ALG setting in WAN Setup.
Yes, the SIP service I use only uses port 5060 and the telephone is configured to use 5060. I did try the suggestions you mentioned before regarding toggling the SIP ALG and trying the TCP/UDP setting. It didn't make a difference. Regardless of how I set it up, I still cannot receive incoming calls but ultimately the websites that check the ports keep telling me that the port is closed.
I forgot to ask the other key question. Does your R8500 have a public IP address on its Internet port? A lot of ISPs are switching to private addresses using CGNAT (Carrier Grade NAT). If this is the case for you, then port forwarding won't work. You would need to lease a public IP from your ISP.