Hi guys. I have what i believe could be a simple problem, i just can't figure it out. I have a simple network setup. A router issuing DHCP (combined firewall). A few laptops running X-Lite and a few Grandstream 100 phones. Now, i have configured the 3CX server for a few lines, a very basic setup. The softphones all register fine when i look at line status. The hardware phones do not though, they appear as not registered. I can call from the Grandstreams to any softphone, not a problem. But i cannot call to the hardware phones or between them. They always show as red, not registered apart from when attempting a call when they come up amber, calling. The error code i get back is 404. Is there any reason they do not appear to be registering, although they can make calls. Thanks guys.