I have another weird problem...I just can't help but finding them..... I have a several Polycom 500/501. My 3CX server is multihomed. Real IP Address to the internet, and a 10.X.X.x series of address for internal. If I set the default gateway (0.0.0.0) to the internet facing card, and then set a route 10.X.X.X mask 255.255.255.0 10.X.X.R (where r is my default router LAN ) none of the Polycoms can register or originate calls, though they can receive. On the other hand if I set the second route to 10.X.X.X mask 255.255.255.0 10.X.X.H (where H is the host running 3CX) all is well. Only problem I have is that I cannot VPN into the network and manage my 3CX server without the router route.... Last winkle is that the Grandstreams I have work like a champ either way. When I have the "router route" setup, and wireshark the packets I get a 407 Proxy authentication error every time the telephone tries to register, and I get no entries into the 3CX log... Any ideas out there.