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I am in hopes that you guys can help me. I have a Cisco 303 Phone and I am trying to register that phone from outside the network. I have the port forwarded in my router to the 3cx server. The phone when I am using it inside the network will register fine but once I put the public IP address in there and try to register it does not work at all. I have tried putting my IP with the port # in there for example 54.11.123.444:5060 and without the :5060 neither one is working. I have checked to make sure that "do not Allow reg from outside network" is NOT checked, I am not sure what I may be doing wrong, Can someone please provide me step by step instructions on how to make this work as I need to use this phone at another location on a different network but talking to my server. I have Version 12 of the 3cx server software. Thank you in advance.