<html>I can't seem now to locate the CISCO SIP mail thread, but here is some information. I think I may need to keep the IP address private. Let's just say 142 refers to X.Y.Z.142 etc. Most addresses are on the XYZ network with 255.255.255.248 as the net mask. The router shows WAN Local: 142 Peer: X.Y.V.254 (notice this is X.Y.V and the others are X.Y.Z. So X and Y are same but 3rd byte is different) LAN : IP: 137 DHCP server shows range from 137-141. Though I am actually using static IP addresses in that range. I replaced the SIP phone with a terminal just so I could try SSHing etc, to our sip proxy machine (A.B.C.115) which is also a linux machine. Once I got in, I did a who to see what it thought my originating IP address was. I tried all addresses from 137 - 142. Right off the bat, 137, 140, and 142 caused conflicts (another machine has 140). When I did the who, this is what I got (with IPMAP from external 137 to internal 138) IP IP (from who) Note 1 138 137 142 139 142 - 141 142 - Note 1: I tried 138 again after removing the 138:137 ipmap And as I remember, doing the same thing from 140 showed an IP address of 142. So it looks like no matter what IP address we use, the host machine thinks it is 142 (except with that ipmap). I can't set the SIP phone IP address to 142 or it will conflict. Any ideas how to have the host see the actual IP address? </html>