Our Voip Server had to be rebooted last night, and now the buttons on the test phones (Cisco SPA514G) I have running (we haven't rolled out yet) are blinking orange. The phones aren't showing up in 3CX and the extensions aren't registered. There are some warnings in the Server Event Log last night: Code: STUN server stun.3cx.com:3478 could not be reached (host name is not resolved). It could be that the STUN server you are using is down or a network problem is preventing STUN resolutions. Is this the problem? How do I fix it?