In my LAN, I have about 10 Linksys SPA942s, all registering to a hosted proxy. Calls to/from any of the phones to an outside number (ie through the WAN) seem to work just fine. However, when I try to call from one 942 to another, the call sets up, the phones ring, but no audio, in either direction. The router is a Netopia 3347W and that is providing DHCP, NAT, DNS, etc. We are using an unmanaged switch to provide the remaining ports. Any ideas as to why the phones work Lan-Wan and Wan-Lan, but not Lan-Lan?