I'm having a heck of a time getting my IP Communicator to register over a VPN. It registers in the wink of an eye if I'm in the building, but if I go outside, not so much. I am using IP Communicator 188.8.131.52, the Cisco VPN client 4.0.1 and I'm connecting to a PIX 506. The connection occurs, but IP Comm. just won't register. The thing I'm wondering about is whether my topology might be part of the issue. My CallManager is in site 1. Site 1 is connected using a VPN to site 2 which is where the PIX my IP Comm. computer is connecting to is located. I can ping the TFTP server when the IP Comm. computer is in the building, I cannot ping the TFTP server when I'm connected using the VPN client.