Hi there, I was using windows 2003 server to run 3cx from v.6 and was able to upgrade to v.11 (and all versions in between). Since win 2003 is no longer supported in v.12, I installed windows 2008 and used a backup to setup v12 installation. Everything look fine and works, but for some strange reason 2 out 3 VoIP provides are not registering. After going trough settings multiple times I was not able to get them to register. Then I tried win 2003 machine and everything is working fine with same hardware. Are there any changes in v12 that would cause such behavior? Does anyone have an idea what might be the problem. Thanks.