Hi, I have a very strange problem. My 3CX is working most times. But 3-4 times a day, we starts receiving calls with no sound. Afterward I see in the log, that registration to my voip provider fails. If I try to ping my voip provider, I cant. But the internet is working fine, and my other voip providers is working fine. Only my primary voip provider fails. It is also the one used mostly for both in- and outbund calls. If I restart my Linksys RV042 router, then it would normally start working again. So I think it must be a router problem. But I have disabled firewall and port should be forwarded correct: 3CX Sip UDP 5060~5060 192.168.0.5 Enabled 3CX stun UDP 3478~3478 192.168.0.5 Enabled 3CX UDP 9000~9049 192.168.0.5 Enabled 3cx tunnel TCP 5090~5090 192.168.0.5 Enabled 3CX sip TCP 5060~5060 192.168.0.5 Enabled The Linksys log doesnt show any problem, and firmwareupdate and contact with linksyssupport didnt help. Any ideas?