Hi. I am using 3CX at home and I have, since the start, a strange problem: I've configured 3CX with 3 voip providers and 3 voip gateways. Everything works perfectly: I make an receive calls from all with no problem. I do the firewall tests and it passes all of them. The problem is that after a few days (2..3 days...sometimes more, sometimes less) I loose my communication with the VOIP providers. The still show as green and registered in 3CX but dialing in or out just fails. I run the firewall checker and it fails on the one-to-one port mapping. I reboot the router and everything gets back to normal for a few days. The router has VOIP functions but are turned off. SIP ALG is also turned off. This happened also with another D-Link router and still happens now with a Thomson tg784n. Any ideas on what the problem may be? Thanks. P.S. - The gateways (SPA-3102 and Portech GSM) still work fine even when the providers fail.