I have installed 3cx in a pc with ip 18.104.22.168. And i have created 2 extenssions: 101 and 102. When i try to register a shoftphone in the same pc, there is not problem, it registers. But, when i try to registered in a softphone from a different net, it doesnt work. It is not a NAT problem because 22.214.171.124 is a fix address. Also when i try to register in a N80 over 3G, i get registration fails. what is the problem?